Indentation Error : unindent does not match any outer indentation level

Question

When I compile the Python code below, I get IndentationError: unindent does not match any outer indentation level

Files = os.listdir(".")
monthNum = 1
totMonths = 0
for year in range(2003, 2016):
    os.chdir('./'+str(year))
    for month in range(1, 13):
        totMonths = totMonths +1
        if (month < 10):
            monthStr = str(year)+"0"+str(month)
        else:
            monthStr = str(year)+str(month)

Your code ran fine for me on both [tag:python-2.x] and [tag:python-3.x] — A.J. Uppal, Jun 19 '17 at 16:41
There is a tab under `for month in range`... Just use four spaces — OneCricketeer, Jun 19 '17 at 16:45
@cricket_007 I made a python script to fix this issue automatically: https://github.com/NoahCristino/Python-Format-Fixer — Noah Cristino, Jun 19 '17 at 16:51
@NoahCristino Cool. I always use a text editor with soft tabs, so I don't have that issue — OneCricketeer, Jun 19 '17 at 16:52
You mix tabs and spaces. The second `for` has idented with 4 spaces, the rest of the code use tabs. Use always 4 spaces to indent (PEP8) . — FJSevilla, Jun 19 '17 at 17:03
@NoahCristino Vim, Atom, PyCharm. Anything but notepad, really — OneCricketeer, Jun 19 '17 at 17:09
@cricket_007 Oh. I use notepad++. It's more convenient, since you can just right click, and open with notepad++ — Noah Cristino, Jun 19 '17 at 17:10
@NoahCristino I can also right click and use the options I listed — OneCricketeer, Jun 19 '17 at 17:37

Ceili · Answer 1 · 2017-06-19T16:47:50.190

This error is caused when the actual indentation does not match the expected indentation -- a likely culprit is tabs v spaces, and indentation consistency.

For example, the following code would throw this error:

if true:
    return 1
if false:
     return 2

Note that while the true statement is indented by 4 spaces, the false statement is indented by five.

This example would also throw this error, and depending on your text editor could be invisible (hidden chars added for reference):

if true:
....return 1
if false:
⇥   return 2

In this case the true statement is indented using four space characters, while the false statement is indented using a tab symbol.

Along with the IndendtationError you provided, it should give you the exact line the error is occuring on. That said, the sample you provided is small enough that unindenting & reindenting the whole thing should resolve it.

The error is also caused by mixing tabs and spaces – OneCricketeer Jun 19 '17 at 16:44 — OneCricketeer, Jun 19 '17 at 16:44
Edited to include that information – Ceili Jun 19 '17 at 16:48 — Ceili, Jun 19 '17 at 16:48

Indentation Error : unindent does not match any outer indentation level

1 Answers1