python : unindent does not match any outer indentation level [duplicate]

Question

I am using nested for loops to check if the substring "f" is present in one of the permutation of given string as parameter in the following function.

 import itertools def permute(f,string): permutation_list = [] permutations = itertools.permutations(string) for item in permutations: permutation_list.append(''.join(item)) for item in permutation_list: if f in item: # unindentation error print "YES" break else: print "NO" break if __name__ == "__main__": t1=input() for i in range(0,t1): a=raw_input() b=raw_input() c=a+b print c t2=input() f="" for j in range(0,t2): d=raw_input() f=f+d permute(f,c)

It is giving unindentation error at line 10

Check line permutation_list.append(''.join(item)) for tabs. — awesoon
– awesoon, Commented May 12, 2013 at 15:42
The code you have in your question does not give that error. You have a couple things wrong, though, that still prevent the code from working. For example, all the code starts with indentation; the first level of indentation should be at the left margin. Also, the code under your if __name__... statement is indented improperly. When I fix those, your code works fine. — Bryan Oakley
– Bryan Oakley, Commented May 12, 2013 at 15:48

Burhan Khalid · Accepted Answer · 2013-05-12 15:40:46Z

A few possibilities:

You have all other indents at 3 spaces, but your highlighted line is indented 4 spaces.
You have mixed tabs and spaces.
You didn't start at the first column.

A good Python-aware text editor should highlight these for you and offer a quick fix.

Here is a fixed version:

import itertools def permute(f,string): permutation_list = [] permutations = itertools.permutations(string) for item in permutations: permutation_list.append(''.join(item)) for item in permutation_list: if f in item: # unindentation error print "YES" break else: print "NO" break if __name__ == "__main__": t1=input() for i in range(0,t1): a=raw_input() b=raw_input() c=a+b print c t2=input() f="" for j in range(0,t2): d=raw_input() f=f+d permute(f,c)

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