How to convert the empty string parsed from .txt file to None?

Question

import os

pwd1 = str()
pwd2 = None
pwd3 = ""
pwd4 = " "

print("1:%s" %pwd1)
print("2:%s" %pwd3)
print("3:%s" %pwd3)
print("4:%s" %pwd4)

Test.txt file contents:

[Section1]
username : testuser
password : validpwd

[Section2]
username : testuser
password : validpwd

[Section3]
username : testuser
password : 

[Section4]
username : testuser
password : validpwd

Section3 contains password : as empty line.

I have parsed the value of the "password" field from Section3, and when I tried to print the "password" value, it prints as empty line in output. I need it to mention it as "None". How can I do that?

Does this answer your question? [How to check if the string is empty?](https://stackoverflow.com/questions/9573244/how-to-check-if-the-string-is-empty) — mkrieger1, May 04 '20 at 08:35

Pankaj Mishra · Answer 1 · 2020-05-04T08:50:06.793

0

What you can do is you can check the length of password, while parsing. And if the length is <1, just assign it the value None.

psd = ''
psd = psd.strip()
if len(psd)<1:
    psd= 'None' # you can also just use None without any quotes
print(psd)

edited May 04 '20 at 08:50

answered May 04 '20 at 08:38

Pankaj Mishra

445
6
15

Maybe good to use `psd.strip()` to handle the case where it's just whitespace, ex. `psd = ' '`, which would still print a blank line. – Gino Mempin May 04 '20 at 08:42
1

@GinoMempin `print(None)` prints `None`. Only a bare `None` in the shell will give a blank line. – user2390182 May 04 '20 at 08:44
You could shorten this to `psd = psd or None` ;-) – user2390182 May 04 '20 at 08:44
I appreciate the above two comments and can be incorporated for a more robust solution. Thank you guys. Cheers – Pankaj Mishra May 04 '20 at 08:50

How to convert the empty string parsed from .txt file to None?

1 Answers1