如何在 Python 3 代码中重写我的 append 行？

Question

My code

token = open('out.txt','r')

linestoken=token.readlines()
tokens_column_number = 1
r=[]
for x in linestoken:
    r.append(x.split()[tokens_column_number])
token.close()

print (r)

Output

'"tick2/tick_calculated_2_2020-05-27T11-59-06.json.gz",'

Desired output

"tick2/tick_calculated_2_2020-05-27T11-59-06.json.gz"

How to get rid of '' and , ?

Answer 1

It would be nice to see your input data. I have created an input file which is similar than yours (I hope).

My test file content:

example1 "tick2/tick_calculated_2_2020-05-27T11-59-06.json.gz", aaaa
example2 "tick2/tick_calculated_2_2020-05-27T11-59-07.json.gz", bbbb

You should replace the " , ',' characters.

You can do it with replace ( https://docs.python.org/3/library/stdtypes.html#str.replace ):

r.append(x.split()[tokens_column_number].replace('"', "").replace(",", ""))

You can do it with strip ( https://docs.python.org/2/library/string.html#string.strip ):

r.append(x.split()[tokens_column_number].strip('",'))

You can do it with re.sub ( https://docs.python.org/3/library/re.html#re.sub ):

import re

...
...
for x in linestoken:
    x = re.sub('[",]', "", x.split()[tokens_column_number])
    r.append(x)
...
...

Output in both cases:

>>> python3 test.py
['tick2/tick_calculated_2_2020-05-27T11-59-06.json.gz', 'tick2/tick_calculated_2_2020-05-27T11-59-07.json.gz']

---

As you can see above the output ( r ) is a list type but if you want to get the result as a string, you should use the join ( https://docs.python.org/3/library/stdtypes.html#str.join ).

Output with print(",".join(r)) :

>>> python3 test.py
tick2/tick_calculated_2_2020-05-27T11-59-06.json.gz,tick2/tick_calculated_2_2020-05-27T11-59-07.json.gz

Output with print("\n".join(r)) :

>>> python3 test.py
tick2/tick_calculated_2_2020-05-27T11-59-06.json.gz
tick2/tick_calculated_2_2020-05-27T11-59-07.json.gz