How to convert simple string into an int in Python (pyramid)

Question

Trying to convert friend id "5" into a number in Python

When I try to convert this string into a number I get an error:

[Applications/MAMP/htdocs/WhoAt/env/www/www/views/contacts/contacts.py line:63]
un_friend()
     ->contact = int(friend)

ValueError: invalid literal for int() with base 10: '"5"'

Python

## friend is "5" str
friend = self.request.body
## Tried:
contact = int(friend)
## and just:
int(friend)

I found the code I tried above here and here. Neither work and both cause the error above.

Do you see what I'm doing wrong? I don't want to have to create a new def just to convert this, isn't there a way to do this with a few characters?

score 3 · Accepted Answer · answered Mar 27 '14 at 15:40

3

"5" is in double quotes, strip them:

int(friend.strip('"'))

Demo:

>>> s = '"5"'
>>> int(s)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '"5"'
>>> int(s.strip('"'))
5

answered Mar 27 '14 at 15:40

alecxe

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Doing `friend.strip()` could get you in trouble. Make sure you are aware of the bounds on the friendship. – Two-Bit Alchemist Mar 27 '14 at 15:41
Or use `int(eval(s))`. But can be dangerous too. If you have mixed str/int, `int(eval(str(s)))`. – fredtantini Mar 27 '14 at 15:41
Thanks! I come from javascript and "" mean's a string, still very newb at Python :) – Leon Gaban Mar 27 '14 at 15:46
2

`""` and `''` mean string in Python as well, but just like in JavaScript if you nest them `'""'` or `"''"`, you get a string with quotes inside it. In either language, `'"5"' != "5"`. – Two-Bit Alchemist Mar 27 '14 at 15:50

score 2 · Answer 2 · answered Mar 27 '14 at 15:41

2

It is because your string is "5" instead of 5, notice the double quote.

answered Mar 27 '14 at 15:41

locoyou

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How to convert simple string into an int in Python (pyramid)

2 Answers2