I'm stuck, I've searched several ways and I can't get the correct output.
string = "Hello! I have a Big!!! problem 666 is not a good number__$"
ns =''.join([i for i in string if i.isalpha()])
print(ns)
HelloIhaveaBigproblemisnotagoodnumber
I want this output:
Hello I have a Big problem is not a good number
Can you help me? Thank you!!
You could increase the conditions used for each character, e.g.,
ns =''.join([i for i in string if i == " " or i.isalpha()])
But there is a problem with sequences like "666 " that leave an extra space in the text.
Instead, you could use a regex to break the string down into a list of words and intervening non-word text. Filter out the stuff you don't want, and then remove any items where the word itself went to zero size.
import re
string = "Hello! I have a Big!!! problem 666 is not a good number__$"
tmp = []
for word, other in re.findall(r"(\w+)([^\w]*)", string):
# strip non-alpha
word = "".join(c for c in word if c.isalpha())
# preserve only spaces
other = "".join(c for c in other if c == " ")
# only add if word still exists
if word:
tmp.append(word + other)
ns = "".join(tmp)
print(ns)
Output
Hello I have a Big problem is not a good number
Filter uisng re & remove them using re.sub
import re
string = "Hello! I have a Big!!! problem 666 is not a good number__$"
print (re.sub('[^a-zA-Z]+', ' ', string))
output #
Hello I have a Big problem is not a good number
You can use:
import re
string = "Hello! I have a Big!!! problem 666 is not a good number__$"
regex = re.compile('[^a-zA-Z ]')
print(regex.sub('', string))
And it will print:
Hello I have a Big problem is not a good number
(With double space between "problem" and "is")
If you want to remove the double space you write it like this:
import re
string = "Hello! I have a Big!!! problem 666 is not a good number__$"
regex = re.compile('[^a-zA-Z ]')
string = regex.sub('', string)
print(string.replace(' ', ' '))
And now the output will be:
Hello I have a Big problem is not a good number
A lot of simple problems can be solved without the re library.
For this case, you can filter all characters that are not in the alphabet, or empty spaces:
from string import ascii_lowercase
ns = ''.join(filter(lambda c: c.lower() in ascii_lowercase+' ', s))
while ' ' in ns: ns = ns.replace(' ',' ')
# output:
# 'Hello I have a Big problem is not a good number'
Repeated spaces are filtered in the one-liner while-loop found above.
To work with non-english characters, you can replace ascii_lowercase with the desired choice of characters.
