Скачать или смотреть Unix & Linux: What is the python equivalent of grep -v? (2 Solutions!!)

Unix & Linux: What is the python equivalent of grep -v?


The Question: I like grep -v. I use it all the time. But I am also doing some text processing
in python, and there is one crucial thing that I lack.
Usually, I use grep -v to take extraneous stuff out of text.
For instance,
$ grep -v '[a-z]'
(I manually review this output to confirm that I don't want those lines)

$ grep '[a-z]' ＞ linesiwanted
But how do I match the complement of a regex in Python? For instance, the
complement of \w?

Solutions: Please watch the whole video to see all solutions, in order of how many people found them helpful

== This solution helped 18 people ==
A regex in Python, either the search or match methods, returns a Match object
or None. For grep -v equivalent, you might use:
import re
for line in sys.stdin:
if re.search(r'[a-z]', line) is None:
sys.stdout.write(line)
Or more concisely:
import re; sys.stdout.writelines([line for line in sys.stdin if re.search(r'[a-
z]', line) is None])

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