Unindent does not match any outer indentation level. What does this mean

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Python

def factorial(n):
	if n == 1:
		return 1
	else:
		return n*factorial(n-1)


sum1 = []
sum =0
t = int(input("number of test cases:"))
count = 0
lism =[]
for i in range(t):
	print("test case:",i)
	r = int(input("enter the number of elements:"))# here 
    while r > 0:
        i = input("enter the elements of the list:")
        lis += [i]# here
        r -= 1
        lism.append(lis)
    lis = []

for n in lism:
	e = 0
	m = len(n)
print(m)

What does this mean and how it can be corrected because I am tried it but this isn,t fixing. i searched on google too but didn't found a useful solution.Please help to correct my code and also tell about the error it is showing.

What I have tried:

File "C:/Users/cheta/PycharmProjects/myproject/venv/practice.py", line 16
while r>0:
^
IndentationError: unindent does not match any outer indentation level

This is the complete output

Posted 15-Aug-19 19:22pm

Member 14517556

Updated 6-Jan-20 2:10am

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2 solutions

Solution 2

Quote:
Unindent does not match any outer indentation level. What does this mean

This means that you can't have a line indented tabs ans the next with spaces. tabs and spaces are not interchangeable.

Python

for i in range(t):
	print("test case:",i)                           # here is indented with tab
	r = int(input("enter the number of elements:")) # here is indented with tab
    while r > 0:                                    # here is indented with spaces

You need to make your mind, you indent either with tabs, either with spaces, but you don't mix.

Posted 15-Aug-19 20:08pm

Patrice T

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OriginalGriff · Accepted Answer · 2019-08-15T19:48:00

Python uses indentation to define code blocks, you can indent code by any amount, but it must match exactly in order to be at the same level.
so this is fine:

Python

if a==b :
   if c==d :
      x()
   y()
z()

But this:

Python

if a==b :
   if c==d :
      x()
 y()
z()

Will give you an indentation error because the call to y is not "lined up" with either if so the system doesn't know what to do with it.

Now, your code looks fine, but ... tabs and spaces are likely to be the problem. Editors that use tabs indent to the same position, but if you mix spaces in as well then the compiler doesn't know how many spaces a tab is supposed to represent.

Check your editor: some allow "show marks" to indicate tabs differently from spaces, some allow you to replace tabs with spaces (I'd turn that one on if I was you).

This is just one of the reasons I don't use Python: it's not designed to produce good, reliable, maintainable code!

Unindent does not match any outer indentation level. What does this mean

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