CODEWITHSUNDEEP
pythonpython-2.7list
asteroid4u
asteroid4u

Reputation: 135

multiple list compare with file line in python

Code (incomplete):

list1 = ['1', '2', '3']
list2 = ['a', 'b', 'c']
list3 = ['12' '13' '14']
for list_in in list1:
    with open("buffer_file") as f:
        for line in f:
            if len(line.split(" ")) >= 3:
                var1 = line.split(" ")
                if var1[0] == list1[0] and var[1] == list2[0] and var[3] == list3[0]:

buffer_file:

no
priority enabled
1 a 12  
2 b 13
3 d 14
pump it

What I am trying here is if in file line and list values are matched then print file line is matched.

Example 1:

 list1[0], list2[0], list3[0]

is matched with line contains 1 a 12 values so print matched

Example 2:

 list1[1], list2[1], list3[1]

is matched with line contains 2 b 13 values so print matched

Example 3:

list1[2], list2[2], list3[2]

is not matched because line contains 3 d 12 values print not matched and also print not matched element that is d

Any one please suggest me what is the best way get this done. I am struck in middle of my code.

Upvotes: 0

Views: 68

Answers (2)

alexis
alexis

Reputation: 50190

You can zip your three lists so that you can grab and check their values as triplets of aligned elements.

expected = zip(list1, list2, list3)
print expected 
[ ('1', 'a', '12'), ('2', 'b', '13'), ... ]

If the lines in the file match your list elements one to one, you can then use zip() again to loop through the expected and actual values together. zip() is your friend. (If the file has extra lines, use a variable to walk down the list of triples.)

with open("buffer_file") as f:
    for exp, actual in zip(expected, f):
        if exp == actual.split():   # compares two 3-tuples
           <etc.>

Upvotes: 1

Jack Evans
Jack Evans

Reputation: 1717

Reading between the lines a bit here. Essentially sounds line you want to ignore all the lines are't triples, enumerate over the file and find matches in your original list.

values = [
    ['1', '2', '3'],
    ['a', 'b', 'c'],
    ['12', '13', '14'],
]

def triples(line):
    return len(line.split()) >= 3


with open("test_file.txt") as f:
    content = filter(triples, (map(str.strip, f.readlines())))
    # Loop over the file keeping track of index
    for index, line in enumerate(content):
        # Compare split line and triples
        if line.split() == list(map(itemgetter(index), values)):
            print(line)

Gives me, where "test_file.txt" contains your listed input

1 a 12
2 b 13

Upvotes: 0

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