CODEWITHSUNDEEP
pythonregexstring
DatCra
DatCra

Reputation: 373

Python remove leading whitespace error

It looked simple, "remove whitespace from a string in the list". But for some reason, my code didn't work. 

new_list = []
channels = "KMP, PRIME"
channel = channels.split(",")

for each in channel:
    re.sub(r'^[^a-zA-Z]*', ' ', each)
    new_list.append(each)

I also tried lstrip/strip, but none worked. Why? If I "cheat" with the following code, it will work. I still want to get to the bottom of the problem. What should I change to make it right?

channel = channels.split(", ")

Upvotes: 0

Views: 67

Answers (3)

Aaditya Ura
Aaditya Ura

Reputation: 12669

You can try this approach too:

print(list(map(lambda x:x.strip(),channels.split(','))))

output:

['KMP', 'PRIME']

Upvotes: 0

jpp
jpp

Reputation: 164643

Here is one way using a list comprehension and str.strip.

Note it does not appear you require regex for this task.

channels = 'KMP, PRIME'

lst = [i.strip() for i in channels.split(',')]
# ['KMP', 'PRIME']

res = ','.join(lst)
# KMP,PRIME

Upvotes: 3

Stephen Rauch
Stephen Rauch

Reputation: 49784

From the (Docs):

Return the string obtained by replacing the leftmost non-overlapping occurrences of pattern in string by ...

You need to keep the value retuned by .sub()

for each in channel:
    new_list.append(re.sub(r'^[^a-zA-Z]*', ' ', each))

Upvotes: 1

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