Looping with regex (Python) appending after match to a list

user_12815743 0
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So I'am trying to append every match of a string into a list with regex. So here is my code. It only doesn't work (properly) unfortunatly. 

seq = 'ABABABBBASHDBDHBEHDBEDH'
Empty_list = []
regex_ex = re.finditer(r'.{3}', seq)
for x in regex_ex:
    Empty_list.append(x)
for-loop list python regex
2 Answers

You're saving match object instead of matched string:

seq = 'ABABABBBASHDBDHBEHDBEDH'
Empty_list = []
regex_ex = re.finditer(r'.{3}', seq)
for x in regex_ex:
    Empty_list.append(x.group(0)) # saves matched string
print(Empty_list)

Output:

['ABA', 'BAB', 'BBA', 'SHD', 'BDH', 'BEH', 'DBE']

user_56368580

to access the value of your match you should use re.Match.group method:

for x in regex_ex:
    Empty_list.append(x.group())

you could replace your for loop code with a list comprehension:

Empty_list = [x.group() for x in  re.finditer(r'.{3}', seq)]
print(Empty_list)

output:

['ABA', 'BAB', 'BBA', 'SHD', 'BDH', 'BEH', 'DBE']

if you want a more compact code:

list(map(re.Match.group, re.finditer(r'.{3}', seq)))

output:

['ABA', 'BAB', 'BBA', 'SHD', 'BDH', 'BEH', 'DBE']
user_31615750
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