CODEWITHSUNDEEP
pythonif-statementuppercaselowercasecapitalize
SkyBlade16395
SkyBlade16395

Reputation: 127

if/else statements accepting strings in both capital and lower-case letters in python

Is there a quick way for an "if" statement to accept a string regardless of whether it's lower-case, upper-case or both in python?

I'm attempting to write a piece of code where the number "3" can be entered as well as the word "three"or "Three" or any other mixture of capital and lower-case and it will still be accepted by the "if" statement in the code. I know that I can use "or" to get it to accept "3" as well as any other string however don't know how to get it to accept the string in more than one case. So far I have:

if (Class == "3" or Class=="three"):
    f=open("class3.txt", "a+")

Upvotes: 9

Views: 25827

Answers (6)

michaelpri
michaelpri

Reputation: 3651

Just convert Class to lowercase using str.lower() and test it.

if Class == "3" or Class.lower() == "three":
    f=open("class3.txt", "a+")

Of course, you can also use str.upper() too.

if Class == "3" or Class.upper() == "THREE":
    f=open("class3.txt", "a+")

One last thing is that you can check for "3" and "three" at the same time using in.

if Class.lower() in {"3", "three"}:
    f=open("class3.txt", "a+")

When using in for an if statement, you have several options. You can use a set, {"3", "three"}, which I used, a list, ["3", "three"], or a tuple, ("3", "three").

One last thing to note is that calling str.lower() or str.upper() on "3" will give you "3", but calling it on the integer 3, will throw an error, so you can't use in if 3 as an integer is a possibly value for Class.

Upvotes: 9

Eric Renouf
Eric Renouf

Reputation: 14510

Typically to do an insensitive compare I'll make my variable lowercase. Though Class is a risky name to use because class is s keyword you could do the following

Class = Class.lower()
if(Class =="3" or Class=="three"):

And so forth

I'd save it as lower only if you don't need to preserve the case for anything later, and especially if you have other comparisons like against "four" as well

Upvotes: 2

Tanveer Alam
Tanveer Alam

Reputation: 5275

You can use in operator with list.

if Class.lower() in ['3', 'three']:

Just for reference '3'.lower() returns string 3.

>>> '3'.lower()
'3'

Upvotes: 11

Mike Müller
Mike Müller

Reputation: 85482

Make the string lower case.:

Class.lower() == "three"

Upvotes: 1

Liam Marshall
Liam Marshall

Reputation: 1593

You can just force all strings to lower case and only check the lower case like this:

if (Class == "3" or Class.lower() == "three"):
    f=open("class3.txt", "a+")

Upvotes: 4

NendoTaka
NendoTaka

Reputation: 1224

If you use string.lower() you can turn the whole string to lower case so you can check it in an if statement. Just replace string with your actual string. So Class.lower()

Upvotes: 2

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