CODEWITHSUNDEEP
pythonlist
showkey
showkey

Reputation: 338

how to simplify the way to delete blank string in a list?

x=["x1",""," ","   ","y1"]
y=[]
import re
for id in range(0,5):
    if(not re.findall("^\s*$",x[id])): y.append(x[id])

y
["x1","y1"]

I can delete blank string in a list in python,it feels complicated,how can i simplify my code?

Upvotes: 0

Views: 88

Answers (4)

bpceee
bpceee

Reputation: 416

y = filter(lambda i: i.strip(), x)
#['x1', 'y1']

or more succinct version by @Jiri

filter(str.strip, x)

Upvotes: 2

thefourtheye
thefourtheye

Reputation: 239433

You can either use list comprehension based filtering, like this

print [current_string for current_string in x if current_string.strip() != ""]
# ['x1', 'y1']

In Python, an empty string is considered as Falsy. So, the same can be written succinctly like this

print [current_string for current_string in x if current_string.strip()]

Apart from that, you can use the filter function, to filter out the empty strings like this

stripper, x = str.strip, ["x1",""," ","   ","y1"]
print filter(stripper, x)

Upvotes: 0

doniyor
doniyor

Reputation: 37846

>>> o = ['','1']
>>> n = []
>>> for each in o:
     if each.strip():
        n.append(each)
>>> n
['1']
>>>

Upvotes: 0

zhangxaochen
zhangxaochen

Reputation: 33997

list comprehension with if statement:

y = [i for i in x if i.strip()]
#['x1', 'y1']

Upvotes: 2

Related Questions