I have a piece of code like this further down.
With this code I get a:
local variable 'commentsMade' referenced before assignment
TARGET_LINE1 = r'someString'
TARGET_LINE2 = r'someString2'
TARGET_LINES = [TARGET_LINE1, TARGET_LINE2]
commentsMade = 2
def replaceLine(pattern, replacement, line, adding):
#global commentsMade # =========> Doesn't work. Uncommenting this does!!!!
match = re.search(pattern, line)
line = re.sub(pattern, replacement, line)
print 'Value before = %d ' % commentsMade
commentsMade += adding
print 'Value after = %d ' % commentsMade
def commentLine(pattern, line):
lineToComment = r'(\s*)(' + pattern + r')(\s*)$'
return replaceLine(lineToComment, r'\1<!--\2-->\3', line, +1)
with open('pom.xml', 'r+') as pomFile:
lines = pomFile.readlines()
for line in lines:
if commentsMade < 2:
for targetLine in TARGET_LINES: # ===> Why this works???
line = commentLine(targetLine, line)
if __name__ == "__main__":
If you make an assignment to a variable in the body of a function, then Python treats the variable as local (unless you declare it global). If you just read the value within the body of a function, without assigning to it, then it looks for the variable in a higher scope (e.g., parent function or global).
So in your case, the difference is that you assign to
commentsMade, which makes it local, but you don't assign to
TARGET_LINES, so it looks for a global definition for it.