Guido van Rossum | e7b146f | 2000-02-04 15:28:42 +0000 | [diff] [blame] | 1 | """Extract, format and print information about Python stack traces.""" |
Guido van Rossum | 526beed | 1994-07-01 15:36:46 +0000 | [diff] [blame] | 2 | |
| 3 | import linecache |
Guido van Rossum | 526beed | 1994-07-01 15:36:46 +0000 | [diff] [blame] | 4 | import sys |
| 5 | |
Skip Montanaro | 40fc160 | 2001-03-01 04:27:19 +0000 | [diff] [blame] | 6 | __all__ = ['extract_stack', 'extract_tb', 'format_exception', |
| 7 | 'format_exception_only', 'format_list', 'format_stack', |
Neil Schemenauer | f607fc5 | 2003-11-05 23:03:00 +0000 | [diff] [blame] | 8 | 'format_tb', 'print_exc', 'format_exc', 'print_exception', |
Georg Brandl | c737283 | 2008-05-12 18:03:53 +0000 | [diff] [blame] | 9 | 'print_last', 'print_stack', 'print_tb'] |
Skip Montanaro | 40fc160 | 2001-03-01 04:27:19 +0000 | [diff] [blame] | 10 | |
Guido van Rossum | 194e20a | 1995-09-20 20:31:51 +0000 | [diff] [blame] | 11 | def _print(file, str='', terminator='\n'): |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 12 | file.write(str+terminator) |
Guido van Rossum | dcc057a | 1996-08-12 23:18:13 +0000 | [diff] [blame] | 13 | |
| 14 | |
| 15 | def print_list(extracted_list, file=None): |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 16 | """Print the list of tuples as returned by extract_tb() or |
| 17 | extract_stack() as a formatted stack trace to the given file.""" |
Raymond Hettinger | 10ff706 | 2002-06-02 03:04:52 +0000 | [diff] [blame] | 18 | if file is None: |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 19 | file = sys.stderr |
| 20 | for filename, lineno, name, line in extracted_list: |
| 21 | _print(file, |
| 22 | ' File "%s", line %d, in %s' % (filename,lineno,name)) |
| 23 | if line: |
Eric S. Raymond | ec3bbde | 2001-02-09 09:39:08 +0000 | [diff] [blame] | 24 | _print(file, ' %s' % line.strip()) |
Guido van Rossum | dcc057a | 1996-08-12 23:18:13 +0000 | [diff] [blame] | 25 | |
| 26 | def format_list(extracted_list): |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 27 | """Format a list of traceback entry tuples for printing. |
| 28 | |
| 29 | Given a list of tuples as returned by extract_tb() or |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 30 | extract_stack(), return a list of strings ready for printing. |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 31 | Each string in the resulting list corresponds to the item with the |
| 32 | same index in the argument list. Each string ends in a newline; |
| 33 | the strings may contain internal newlines as well, for those items |
| 34 | whose source text line is not None. |
| 35 | """ |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 36 | list = [] |
| 37 | for filename, lineno, name, line in extracted_list: |
| 38 | item = ' File "%s", line %d, in %s\n' % (filename,lineno,name) |
| 39 | if line: |
Eric S. Raymond | ec3bbde | 2001-02-09 09:39:08 +0000 | [diff] [blame] | 40 | item = item + ' %s\n' % line.strip() |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 41 | list.append(item) |
| 42 | return list |
| 43 | |
Guido van Rossum | 194e20a | 1995-09-20 20:31:51 +0000 | [diff] [blame] | 44 | |
| 45 | def print_tb(tb, limit=None, file=None): |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 46 | """Print up to 'limit' stack trace entries from the traceback 'tb'. |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 47 | |
| 48 | If 'limit' is omitted or None, all entries are printed. If 'file' |
| 49 | is omitted or None, the output goes to sys.stderr; otherwise |
| 50 | 'file' should be an open file or file-like object with a write() |
| 51 | method. |
| 52 | """ |
Raymond Hettinger | 10ff706 | 2002-06-02 03:04:52 +0000 | [diff] [blame] | 53 | if file is None: |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 54 | file = sys.stderr |
| 55 | if limit is None: |
| 56 | if hasattr(sys, 'tracebacklimit'): |
| 57 | limit = sys.tracebacklimit |
| 58 | n = 0 |
| 59 | while tb is not None and (limit is None or n < limit): |
| 60 | f = tb.tb_frame |
Michael W. Hudson | dd32a91 | 2002-08-15 14:59:02 +0000 | [diff] [blame] | 61 | lineno = tb.tb_lineno |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 62 | co = f.f_code |
| 63 | filename = co.co_filename |
| 64 | name = co.co_name |
| 65 | _print(file, |
Georg Brandl | 236f797 | 2009-04-05 14:28:42 +0000 | [diff] [blame] | 66 | ' File "%s", line %d, in %s' % (filename, lineno, name)) |
Hye-Shik Chang | 182ac85 | 2004-10-26 09:16:42 +0000 | [diff] [blame] | 67 | linecache.checkcache(filename) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 68 | line = linecache.getline(filename, lineno, f.f_globals) |
Eric S. Raymond | ec3bbde | 2001-02-09 09:39:08 +0000 | [diff] [blame] | 69 | if line: _print(file, ' ' + line.strip()) |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 70 | tb = tb.tb_next |
| 71 | n = n+1 |
Guido van Rossum | 526beed | 1994-07-01 15:36:46 +0000 | [diff] [blame] | 72 | |
Georg Brandl | 2ad07c3 | 2009-09-16 14:24:29 +0000 | [diff] [blame] | 73 | def format_tb(tb, limit=None): |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 74 | """A shorthand for 'format_list(extract_stack(f, limit)).""" |
| 75 | return format_list(extract_tb(tb, limit)) |
Guido van Rossum | 28e99fe | 1995-08-04 04:30:30 +0000 | [diff] [blame] | 76 | |
Georg Brandl | 2ad07c3 | 2009-09-16 14:24:29 +0000 | [diff] [blame] | 77 | def extract_tb(tb, limit=None): |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 78 | """Return list of up to limit pre-processed entries from traceback. |
| 79 | |
| 80 | This is useful for alternate formatting of stack traces. If |
| 81 | 'limit' is omitted or None, all entries are extracted. A |
| 82 | pre-processed stack trace entry is a quadruple (filename, line |
| 83 | number, function name, text) representing the information that is |
| 84 | usually printed for a stack trace. The text is a string with |
| 85 | leading and trailing whitespace stripped; if the source is not |
| 86 | available it is None. |
| 87 | """ |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 88 | if limit is None: |
| 89 | if hasattr(sys, 'tracebacklimit'): |
| 90 | limit = sys.tracebacklimit |
| 91 | list = [] |
| 92 | n = 0 |
| 93 | while tb is not None and (limit is None or n < limit): |
| 94 | f = tb.tb_frame |
Michael W. Hudson | dd32a91 | 2002-08-15 14:59:02 +0000 | [diff] [blame] | 95 | lineno = tb.tb_lineno |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 96 | co = f.f_code |
| 97 | filename = co.co_filename |
| 98 | name = co.co_name |
Hye-Shik Chang | 182ac85 | 2004-10-26 09:16:42 +0000 | [diff] [blame] | 99 | linecache.checkcache(filename) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 100 | line = linecache.getline(filename, lineno, f.f_globals) |
Eric S. Raymond | ec3bbde | 2001-02-09 09:39:08 +0000 | [diff] [blame] | 101 | if line: line = line.strip() |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 102 | else: line = None |
| 103 | list.append((filename, lineno, name, line)) |
| 104 | tb = tb.tb_next |
| 105 | n = n+1 |
| 106 | return list |
Guido van Rossum | 526beed | 1994-07-01 15:36:46 +0000 | [diff] [blame] | 107 | |
Guido van Rossum | 28e99fe | 1995-08-04 04:30:30 +0000 | [diff] [blame] | 108 | |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 109 | _cause_message = ( |
| 110 | "\nThe above exception was the direct cause " |
| 111 | "of the following exception:\n") |
| 112 | |
| 113 | _context_message = ( |
| 114 | "\nDuring handling of the above exception, " |
| 115 | "another exception occurred:\n") |
| 116 | |
| 117 | def _iter_chain(exc, custom_tb=None, seen=None): |
| 118 | if seen is None: |
| 119 | seen = set() |
| 120 | seen.add(exc) |
| 121 | its = [] |
| 122 | cause = exc.__cause__ |
Nick Coghlan | ab7bf21 | 2012-02-26 17:49:52 +1000 | [diff] [blame] | 123 | if cause is Ellipsis: |
Antoine Pitrou | 7b0d4a2 | 2009-11-28 16:12:28 +0000 | [diff] [blame] | 124 | context = exc.__context__ |
| 125 | if context is not None and context not in seen: |
| 126 | its.append(_iter_chain(context, None, seen)) |
| 127 | its.append([(_context_message, None)]) |
Nick Coghlan | ab7bf21 | 2012-02-26 17:49:52 +1000 | [diff] [blame] | 128 | elif cause is not None and cause not in seen: |
| 129 | its.append(_iter_chain(cause, False, seen)) |
| 130 | its.append([(_cause_message, None)]) |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 131 | its.append([(exc, custom_tb or exc.__traceback__)]) |
Hirokazu Yamamoto | 54a1cc6 | 2008-09-09 17:55:11 +0000 | [diff] [blame] | 132 | # itertools.chain is in an extension module and may be unavailable |
| 133 | for it in its: |
| 134 | for x in it: |
| 135 | yield x |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 136 | |
| 137 | |
| 138 | def print_exception(etype, value, tb, limit=None, file=None, chain=True): |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 139 | """Print exception up to 'limit' stack trace entries from 'tb' to 'file'. |
| 140 | |
| 141 | This differs from print_tb() in the following ways: (1) if |
| 142 | traceback is not None, it prints a header "Traceback (most recent |
| 143 | call last):"; (2) it prints the exception type and value after the |
| 144 | stack trace; (3) if type is SyntaxError and value has the |
| 145 | appropriate format, it prints the line where the syntax error |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 146 | occurred with a caret on the next line indicating the approximate |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 147 | position of the error. |
| 148 | """ |
Raymond Hettinger | 10ff706 | 2002-06-02 03:04:52 +0000 | [diff] [blame] | 149 | if file is None: |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 150 | file = sys.stderr |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 151 | if chain: |
| 152 | values = _iter_chain(value, tb) |
| 153 | else: |
| 154 | values = [(value, tb)] |
| 155 | for value, tb in values: |
| 156 | if isinstance(value, str): |
| 157 | _print(file, value) |
| 158 | continue |
| 159 | if tb: |
| 160 | _print(file, 'Traceback (most recent call last):') |
| 161 | print_tb(tb, limit, file) |
| 162 | lines = format_exception_only(type(value), value) |
Georg Brandl | 236f797 | 2009-04-05 14:28:42 +0000 | [diff] [blame] | 163 | for line in lines: |
| 164 | _print(file, line, '') |
Guido van Rossum | 28e99fe | 1995-08-04 04:30:30 +0000 | [diff] [blame] | 165 | |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 166 | def format_exception(etype, value, tb, limit=None, chain=True): |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 167 | """Format a stack trace and the exception information. |
| 168 | |
| 169 | The arguments have the same meaning as the corresponding arguments |
| 170 | to print_exception(). The return value is a list of strings, each |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 171 | ending in a newline and some containing internal newlines. When |
| 172 | these lines are concatenated and printed, exactly the same text is |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 173 | printed as does print_exception(). |
| 174 | """ |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 175 | list = [] |
| 176 | if chain: |
| 177 | values = _iter_chain(value, tb) |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 178 | else: |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 179 | values = [(value, tb)] |
| 180 | for value, tb in values: |
| 181 | if isinstance(value, str): |
| 182 | list.append(value + '\n') |
| 183 | continue |
| 184 | if tb: |
| 185 | list.append('Traceback (most recent call last):\n') |
| 186 | list.extend(format_tb(tb, limit)) |
| 187 | list.extend(format_exception_only(type(value), value)) |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 188 | return list |
Guido van Rossum | 28e99fe | 1995-08-04 04:30:30 +0000 | [diff] [blame] | 189 | |
| 190 | def format_exception_only(etype, value): |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 191 | """Format the exception part of a traceback. |
| 192 | |
| 193 | The arguments are the exception type and value such as given by |
| 194 | sys.last_type and sys.last_value. The return value is a list of |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 195 | strings, each ending in a newline. |
| 196 | |
| 197 | Normally, the list contains a single string; however, for |
| 198 | SyntaxError exceptions, it contains several lines that (when |
| 199 | printed) display detailed information about where the syntax |
| 200 | error occurred. |
| 201 | |
| 202 | The message indicating which exception occurred is always the last |
| 203 | string in the list. |
| 204 | |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 205 | """ |
Thomas Wouters | 89f507f | 2006-12-13 04:49:30 +0000 | [diff] [blame] | 206 | # Gracefully handle (the way Python 2.4 and earlier did) the case of |
| 207 | # being called with (None, None). |
| 208 | if etype is None: |
| 209 | return [_format_final_exc_line(etype, value)] |
| 210 | |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 211 | stype = etype.__name__ |
Guido van Rossum | 6a2a2a0 | 2006-08-26 20:37:44 +0000 | [diff] [blame] | 212 | smod = etype.__module__ |
Georg Brandl | 1a3284e | 2007-12-02 09:40:06 +0000 | [diff] [blame] | 213 | if smod not in ("__main__", "builtins"): |
Guido van Rossum | 6a2a2a0 | 2006-08-26 20:37:44 +0000 | [diff] [blame] | 214 | stype = smod + '.' + stype |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 215 | |
| 216 | if not issubclass(etype, SyntaxError): |
| 217 | return [_format_final_exc_line(stype, value)] |
| 218 | |
| 219 | # It was a syntax error; show exactly where the problem was found. |
| 220 | lines = [] |
Guido van Rossum | 33d2689 | 2007-08-05 15:29:28 +0000 | [diff] [blame] | 221 | filename = value.filename or "<string>" |
| 222 | lineno = str(value.lineno) or '?' |
| 223 | lines.append(' File "%s", line %s\n' % (filename, lineno)) |
| 224 | badline = value.text |
| 225 | offset = value.offset |
| 226 | if badline is not None: |
| 227 | lines.append(' %s\n' % badline.strip()) |
| 228 | if offset is not None: |
Georg Brandl | 3cfdd9c | 2009-06-04 10:21:10 +0000 | [diff] [blame] | 229 | caretspace = badline.rstrip('\n')[:offset].lstrip() |
Guido van Rossum | 33d2689 | 2007-08-05 15:29:28 +0000 | [diff] [blame] | 230 | # non-space whitespace (likes tabs) must be kept for alignment |
| 231 | caretspace = ((c.isspace() and c or ' ') for c in caretspace) |
| 232 | # only three spaces to account for offset1 == pos 0 |
| 233 | lines.append(' %s^\n' % ''.join(caretspace)) |
| 234 | msg = value.msg or "<no detail available>" |
| 235 | lines.append("%s: %s\n" % (stype, msg)) |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 236 | return lines |
| 237 | |
| 238 | def _format_final_exc_line(etype, value): |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 239 | valuestr = _some_str(value) |
| 240 | if value is None or not valuestr: |
| 241 | line = "%s\n" % etype |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 242 | else: |
Thomas Wouters | 0e3f591 | 2006-08-11 14:57:12 +0000 | [diff] [blame] | 243 | line = "%s: %s\n" % (etype, valuestr) |
| 244 | return line |
Guido van Rossum | 28e99fe | 1995-08-04 04:30:30 +0000 | [diff] [blame] | 245 | |
Guido van Rossum | 2823f03 | 2000-08-22 02:04:46 +0000 | [diff] [blame] | 246 | def _some_str(value): |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 247 | try: |
| 248 | return str(value) |
| 249 | except: |
| 250 | return '<unprintable %s object>' % type(value).__name__ |
Guido van Rossum | 2823f03 | 2000-08-22 02:04:46 +0000 | [diff] [blame] | 251 | |
Guido van Rossum | 526beed | 1994-07-01 15:36:46 +0000 | [diff] [blame] | 252 | |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 253 | def print_exc(limit=None, file=None, chain=True): |
Neal Norwitz | ac3625f | 2006-03-17 05:49:33 +0000 | [diff] [blame] | 254 | """Shorthand for 'print_exception(*sys.exc_info(), limit, file)'.""" |
Raymond Hettinger | 10ff706 | 2002-06-02 03:04:52 +0000 | [diff] [blame] | 255 | if file is None: |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 256 | file = sys.stderr |
| 257 | try: |
| 258 | etype, value, tb = sys.exc_info() |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 259 | print_exception(etype, value, tb, limit, file, chain) |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 260 | finally: |
| 261 | etype = value = tb = None |
Guido van Rossum | 526beed | 1994-07-01 15:36:46 +0000 | [diff] [blame] | 262 | |
Neil Schemenauer | f607fc5 | 2003-11-05 23:03:00 +0000 | [diff] [blame] | 263 | |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 264 | def format_exc(limit=None, chain=True): |
Neil Schemenauer | f607fc5 | 2003-11-05 23:03:00 +0000 | [diff] [blame] | 265 | """Like print_exc() but return a string.""" |
| 266 | try: |
| 267 | etype, value, tb = sys.exc_info() |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 268 | return ''.join( |
| 269 | format_exception(etype, value, tb, limit, chain)) |
Neil Schemenauer | f607fc5 | 2003-11-05 23:03:00 +0000 | [diff] [blame] | 270 | finally: |
| 271 | etype = value = tb = None |
Tim Peters | 58eb11c | 2004-01-18 20:29:55 +0000 | [diff] [blame] | 272 | |
Neil Schemenauer | f607fc5 | 2003-11-05 23:03:00 +0000 | [diff] [blame] | 273 | |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 274 | def print_last(limit=None, file=None, chain=True): |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 275 | """This is a shorthand for 'print_exception(sys.last_type, |
| 276 | sys.last_value, sys.last_traceback, limit, file)'.""" |
Benjamin Peterson | e549ead | 2009-03-28 21:42:05 +0000 | [diff] [blame] | 277 | if not hasattr(sys, "last_type"): |
| 278 | raise ValueError("no last exception") |
Raymond Hettinger | 10ff706 | 2002-06-02 03:04:52 +0000 | [diff] [blame] | 279 | if file is None: |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 280 | file = sys.stderr |
| 281 | print_exception(sys.last_type, sys.last_value, sys.last_traceback, |
Benjamin Peterson | e652821 | 2008-07-15 15:32:09 +0000 | [diff] [blame] | 282 | limit, file, chain) |
Guido van Rossum | dcc057a | 1996-08-12 23:18:13 +0000 | [diff] [blame] | 283 | |
| 284 | |
| 285 | def print_stack(f=None, limit=None, file=None): |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 286 | """Print a stack trace from its invocation point. |
Tim Peters | a19a168 | 2001-03-29 04:36:09 +0000 | [diff] [blame] | 287 | |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 288 | The optional 'f' argument can be used to specify an alternate |
| 289 | stack frame at which to start. The optional 'limit' and 'file' |
| 290 | arguments have the same meaning as for print_exception(). |
| 291 | """ |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 292 | if f is None: |
| 293 | try: |
| 294 | raise ZeroDivisionError |
| 295 | except ZeroDivisionError: |
| 296 | f = sys.exc_info()[2].tb_frame.f_back |
| 297 | print_list(extract_stack(f, limit), file) |
Guido van Rossum | dcc057a | 1996-08-12 23:18:13 +0000 | [diff] [blame] | 298 | |
| 299 | def format_stack(f=None, limit=None): |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 300 | """Shorthand for 'format_list(extract_stack(f, limit))'.""" |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 301 | if f is None: |
| 302 | try: |
| 303 | raise ZeroDivisionError |
| 304 | except ZeroDivisionError: |
| 305 | f = sys.exc_info()[2].tb_frame.f_back |
| 306 | return format_list(extract_stack(f, limit)) |
Guido van Rossum | dcc057a | 1996-08-12 23:18:13 +0000 | [diff] [blame] | 307 | |
Georg Brandl | 2ad07c3 | 2009-09-16 14:24:29 +0000 | [diff] [blame] | 308 | def extract_stack(f=None, limit=None): |
Jeremy Hylton | 69e9e8b | 2001-03-21 19:09:31 +0000 | [diff] [blame] | 309 | """Extract the raw traceback from the current stack frame. |
| 310 | |
| 311 | The return value has the same format as for extract_tb(). The |
| 312 | optional 'f' and 'limit' arguments have the same meaning as for |
| 313 | print_stack(). Each item in the list is a quadruple (filename, |
| 314 | line number, function name, text), and the entries are in order |
| 315 | from oldest to newest stack frame. |
| 316 | """ |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 317 | if f is None: |
| 318 | try: |
| 319 | raise ZeroDivisionError |
| 320 | except ZeroDivisionError: |
| 321 | f = sys.exc_info()[2].tb_frame.f_back |
| 322 | if limit is None: |
| 323 | if hasattr(sys, 'tracebacklimit'): |
| 324 | limit = sys.tracebacklimit |
| 325 | list = [] |
| 326 | n = 0 |
| 327 | while f is not None and (limit is None or n < limit): |
Michael W. Hudson | dd32a91 | 2002-08-15 14:59:02 +0000 | [diff] [blame] | 328 | lineno = f.f_lineno |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 329 | co = f.f_code |
| 330 | filename = co.co_filename |
| 331 | name = co.co_name |
Hye-Shik Chang | 182ac85 | 2004-10-26 09:16:42 +0000 | [diff] [blame] | 332 | linecache.checkcache(filename) |
Thomas Wouters | 49fd7fa | 2006-04-21 10:40:58 +0000 | [diff] [blame] | 333 | line = linecache.getline(filename, lineno, f.f_globals) |
Eric S. Raymond | ec3bbde | 2001-02-09 09:39:08 +0000 | [diff] [blame] | 334 | if line: line = line.strip() |
Tim Peters | b90f89a | 2001-01-15 03:26:36 +0000 | [diff] [blame] | 335 | else: line = None |
| 336 | list.append((filename, lineno, name, line)) |
| 337 | f = f.f_back |
| 338 | n = n+1 |
| 339 | list.reverse() |
| 340 | return list |