Python multiple condition IN string

Question

How to merge the condition in array format

lines = [line for line in open('text.txt')if 
        '|E|' in line and
        'GetPastPaymentInfo' in line and
        'CheckData' not in line and
        'UpdatePrintStatus' not in line
        ]

like

lines = [line for line in open('text.txt')if 
        ['|E|','GetPastPaymentInfo'] in line and
        ['CheckData','UpdatePrintStatus'] not in line]

You can't; the list won't be in the line. You could use all. — jonrsharpe
– jonrsharpe, Commented Jun 12, 2015 at 8:01

Kasravnd · Accepted Answer · 2016-02-15 17:02:23Z

8

You can use a generator expression within all function to check the membership for all elements :

lines = [line for line in open('text.txt') if 
        all(i in line for i in ['|E|','GetPastPaymentInfo'])and
        all(j not in line for j in ['CheckData','UpdatePrintStatus'])]

Or if you want to check for words you can split the lines and use intersection method in set ¹:

lines = [line for line in open('text.txt') if 
        {'|E|','GetPastPaymentInfo'}.intersection(line.split()) and not {'CheckData','UpdatePrintStatus'}.intersection(line.split())]

Note that you need to put your words within a set instead of list.

_{1) Note that since set object use hash-table for storing its elements and for returning the items as well, checking the membership has O(1) order and it's more efficient than list which has O(N) order.}

edited Feb 15, 2016 at 17:02

answered Jun 12, 2015 at 8:04

Kasravnd

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