Update the code to better reflect recommended style:
Use != instead of <> since <> is documented as "obsolescent".
Use "is" and "is not" when comparing with None or type objects.
diff --git a/Lib/pipes.py b/Lib/pipes.py
index 4057fac..3aa1bf1 100644
--- a/Lib/pipes.py
+++ b/Lib/pipes.py
@@ -110,7 +110,7 @@
def append(self, cmd, kind):
"""t.append(cmd, kind) adds a new step at the end."""
- if type(cmd) <> type(''):
+ if type(cmd) is not type(''):
raise TypeError, \
'Template.append: cmd must be a string'
if kind not in stepkinds:
@@ -119,7 +119,7 @@
if kind == SOURCE:
raise ValueError, \
'Template.append: SOURCE can only be prepended'
- if self.steps <> [] and self.steps[-1][1] == SINK:
+ if self.steps and self.steps[-1][1] == SINK:
raise ValueError, \
'Template.append: already ends with SINK'
if kind[0] == 'f' and not re.search('\$IN\b', cmd):
@@ -132,7 +132,7 @@
def prepend(self, cmd, kind):
"""t.prepend(cmd, kind) adds a new step at the front."""
- if type(cmd) <> type(''):
+ if type(cmd) is not type(''):
raise TypeError, \
'Template.prepend: cmd must be a string'
if kind not in stepkinds:
@@ -141,7 +141,7 @@
if kind == SINK:
raise ValueError, \
'Template.prepend: SINK can only be appended'
- if self.steps <> [] and self.steps[0][1] == SOURCE:
+ if self.steps and self.steps[0][1] == SOURCE:
raise ValueError, \
'Template.prepend: already begins with SOURCE'
if kind[0] == 'f' and not re.search('\$IN\b', cmd):
@@ -165,7 +165,7 @@
def open_r(self, file):
"""t.open_r(file) and t.open_w(file) implement
t.open(file, 'r') and t.open(file, 'w') respectively."""
- if self.steps == []:
+ if not self.steps:
return open(file, 'r')
if self.steps[-1][1] == SINK:
raise ValueError, \
@@ -174,7 +174,7 @@
return os.popen(cmd, 'r')
def open_w(self, file):
- if self.steps == []:
+ if not self.steps:
return open(file, 'w')
if self.steps[0][1] == SOURCE:
raise ValueError, \
@@ -203,7 +203,7 @@
#
# Make sure there is at least one step
#
- if list == []:
+ if not list:
list.append(['', 'cat', '--', ''])
#
# Take care of the input and output ends