Created
May 4, 2015 15:58
-
-
Save vtemian/039b1383850661cdda59 to your computer and use it in GitHub Desktop.
Python gotcha
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# mutable list | |
def foobar(arg_string="abc", arg_list=[]): | |
print arg_string, arg_list | |
arg_string = arg_string + "xyz" | |
arg_list.append("F") | |
for i in range(4): | |
foobar() | |
""" | |
results | |
abc [] | |
abc ['F'] | |
abc ['F', 'F'] | |
abc ['F', 'F', 'F'] | |
""" | |
# late binding | |
def create_multipliers(): | |
return [lambda x : i * x for i in range(5)] | |
for multiplier in create_multipliers(): | |
print multiplier(2) | |
""" | |
8 | |
8 | |
8 | |
8 | |
8 | |
""" |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment