CODEWITHSUNDEEP
pythonstringlistcomparison
Giomix88
Giomix88

Reputation: 59

Compare two string lists with each other Python

I would like to compare two string lists, locate the common strings and store the common strings in a new list.

For example:

my_list1=['      4,         -40.,         -12.\n',
 '      5,         -40.,         -15.\n',
 '      6,         -40.,         -18.\n',
 '      7,         -40.,         -21.\n',
 '      8,         -40.,         -24.\n',
 '      9,         -40.,         -27.\n',
 '     14,         -30.,         -30.\n',
 '     15,         -28.,         -30.\n']

my_list2=['49',
 '50',
 '51',
 '10',
 '53',
 '54',
 '55',
 '56',
 '57',
 '58',
 '59',
 '60',
 '6162',
 '15',
 '64',
 '65',
 '66']

What I want to do is compare each of the strings of my_list2 with the beginning of the strings in my_list1.

For example my_list1 contains '15' from my_list2 in [ '15, -28., -30.\n'] so i want a new list which is going to save all the common strings

Upvotes: 2

Views: 1107

Answers (2)

Manish Goel
Manish Goel

Reputation: 893

my_list1_new = [i.strip().split(",")[0] for i in my_list1 ]
for i in my_list2:
    if i in my_list1_new:
        print(my_list1[my_list1_new.index(i)])

Upvotes: 0

Moses Koledoye
Moses Koledoye

Reputation: 78546

You can use str.startswith which can take a tuple of items as argument. Left strip each item in the first list and check if the item startswith any of the strings in the second list:

t = tuple(my_list2)
lst = [x for x in my_list1 if x.lstrip().startswith(t)]
print lst
# ['     15,         -28.,         -30.\n']

Upvotes: 3

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