Match multiple strings containing lines from file python

Question

I want to match multiple strings from a file. How do I do this in python ?

Objective: match the lines which is having both values of "DC1" & "TIER2" from file

My code but give matches any string from strings object

strings = ["DC1","TIER2"]
with open(r"D:\kick-6.log", "r" ) as data:
    for deltaa in data:
        deltaa = data.readline().rstrip()
        print ("*********")
        for item in strings:
            if item in deltaa:
                print (deltaa)

You probably just want deltaa = deltaa.rstrip() on the fourth line. — grc
– grc, Commented Jan 4, 2016 at 7:25

PM 2Ring · Accepted Answer · 2016-01-04 10:37:22Z

2

Use all for your checking:

all(iterable) Return True if all elements of the iterable are true (or if the iterable is empty). Equivalent to:
def all(iterable):
    for element in iterable:
        if not element:
            return False
    return True

strings = ["DC1","TIER2"]
with open(r"D:\kick-6.log", "r" ) as data:
    for deltaa in data:
        if all(x in deltaa for x in strings): #Check if all items in strings exit in deltaa
            print (deltaa)

And if you want to check if at least one of strings is in deltaa use any instead:

any(iterable) Return True if any element of the iterable is true. If the iterable is empty, return False. Equivalent to:
def any(iterable):
    for element in iterable:
        if element:
            return True
    return False

strings = ["DC1","TIER2"]
with open(r"D:\kick-6.log", "r" ) as data:
    for deltaa in data:
        if any(x in deltaa for x in strings): #Check if any item in strings exits in deltaa
            print (deltaa)

edited Jan 4, 2016 at 10:37

PM 2Ring

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answered Jan 4, 2016 at 7:37

Iron Fist

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3 Comments

Iron Fist Over a year ago

@veejay .. Feel free to accept my answer

veejay Over a year ago

if i want to print only non matched strings from the above example what to do?

Iron Fist Over a year ago

@veejay...you mean printing lines from file that do not match with strings ?

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