CODEWITHSUNDEEP
pythonpython-2.7for-loop
Ampatishan Arun
Ampatishan Arun

Reputation: 21

How to make exception for a number in the range of for loop in python

In Python when I define a range for a variable, for example 

for i in range(0,9):

but here I want to prevent i from taking a value of 7. How can I do this?

Upvotes: 0

Views: 4844

Answers (1)

Cleb
Cleb

Reputation: 25997

Depends on what exactly you want to do. If you just want to create a list you can simply do:

ignore=[2,7] #list of indices to be ignored
l = [ind for ind in xrange(9) if ind not in ignore]

which yields

[0, 1, 3, 4, 5, 6, 8]

You can also directly use these created indices in a for loop e.g. like this:

[ind**2 for ind in xrange(9) if ind not in ignore]

which gives you

[0, 1, 9, 16, 25, 36, 64]

or you apply a function

def someFunc(value):
    return value**3

[someFunc(ind) for ind in xrange(9) if ind not in ignore]

which yields

[0, 1, 27, 64, 125, 216, 512]

Upvotes: 2

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