忽略python字符串中的制表符和空格

Question

I need to compare two string in python, first string is read from .xlsx file and second is an output from stdout.readlines().

Below code is to get command output.

stdin, stdout, stderr = client.exec_command(testCommand)
op = stdout.readlines()
print("op =\n"+str(op))
str1 = "".join(op)

Since some commands output begin with \\t or might have \\t in between .

For Eg : Below command output begin with \\t and after LEN there is \\t.

#   PASS_MIN_LEN    Minimum acceptable password length.
PASS_MIN_LEN    5

And xlsx file is having

# PASS_MIN_LEN Minimum acceptable password length.
PASS_MIN_LEN 5

As .xlsx comparison string doesn't have \\t, how can i ignore \\t while comparing two string.

if cmdOutput== xlsxOutput:

is not working.

I tried to trim the cmdOutput with \\t, it didn't worked. Any approach can i follow?

Answer 1

if you just want to replace tabs with a space, perhaps str.replace is simple enough. But that doesn't leave the trailing newlines. You might consider the replacement followed by str.strip . For example:

op = [x.replace('\t', ' ').strip() for x in op]
print(op)

['# PASS_MIN_LEN Minimum acceptable password length.', 'PASS_MIN_LEN 5']

If you have other kinds of characters, or multiple characters (missing data, or the like), a more aggressive approach with re gex may be considered:

import re
op = [x for x in map(lambda x: re.sub('\s+', ' ', x).strip(), op)]
print(op) 

['# PASS_MIN_LEN Minimum acceptable password length.', 'PASS_MIN_LEN 5']

Answer 2

You can replace the tab in the command output string with a space.

For example:

cmdOutput.replace('\t', ' ') == xlsxOutput

Answer 3

Read the description for strip() method in official python documentation.

"Return a copy of the string with the leading and trailing characters removed."

So, the characters within the string remain unchanged. Using replace() method is the best solution for your problem.

>>> str1 = "PASS_MIN_LEN\t5"
>>> str2 = "PASS_MIN_LEN 5"
>>> str1.replace('\t', ' ') == str2
True