Python one-liner to make strings lowercase and leave numbers as is

Question

Is there a way to write a one-liner which converts strings to lowercase and leaves numbers alone? So far I have this:

names = ["a","Abc","EFG",45,65]
newlist = [n.lower() for n in names if isinstance(n, basestring)]
print newlist 

>>>['a', 'abc', 'efg']

I would like this

>>>['a', 'abc', 'efg', 45 ,65]

score 2 · Accepted Answer · answered Nov 19 '15 at 11:12

2

Use a conditional expression. You were filtering out non-strings.

Conditional expression: x if condition else y. Return x if condition is True, otherwise return y.

names = [n.lower() if isinstance(n, basestring) else n for n in names]

answered Nov 19 '15 at 11:12

Tom Zych

haha thanks guys for the help. i do appreciate it. – JokerMartini Nov 19 '15 at 11:14
Would the downvoter care to add a comment explaining what they find unsatisfactory in the answer? – Tom Zych Nov 19 '15 at 11:39

score 1 · Answer 2 · answered Nov 19 '15 at 11:16

1

You may avoid use isinstance

[x.lower() if type(x)==str else x for x in names]

answered Nov 19 '15 at 11:16

mmachine

Why would you? That prevents your code from working on types which derive from `str`. – tripleee Nov 19 '15 at 12:20

2 Answers2