Convert Python2 iterkeys() to python3-CodePudding

I have this line from python2 code:

m = w.iterkeys().next();

When trying to run this, I get:

AttributeError: 'collections.OrderedDict' object has no attribute 'iterkeys'

I found out that iterkeys is not supported in Python3.

How to convert this line, in order to be compatible with Python3?

CodePudding user response：

There exist tool for such conversion called 2to3 let say you have code.py file with content as follows

import collections
w = collections.OrderedDict(a=1,b=2,c=3)
m = w.iterkeys().next();
print m

then open terminal and do 2to3 -w code.py, this does alter code.py to

import collections
w = collections.OrderedDict(a=1,b=2,c=3)
m = next(iter(w.keys()));
print(m)

which could be used with python3. Original is kept as code.py.bak.

CodePudding user response：

In python 3.x:

m = w.iterkeys().next()

would be equivalent to:

m = list(w.keys())[0]