Joining two large disk .txt files on ID number if they are separated by newline character?

Question

I need to get this result:

Example input: (two files)

Adam 1234

John 4321

Anderson 4321

Smith 1234

Expected output:

Adam Smith 1234

John Anderson 4321

My code for now works like this, it combines two .txt files… but I can’t figure out how to combine them on the same ID?

    new = []
    with open('full.txt', 'w') as new_file:
        with open('1.txt') as fp_first_name:
            with open('2.txt') as fp_last_name:
                for line1 in fp_first_name:
                    for line2 in fp_last_name:
                        new_file.write(line1[:len(line1[-5:])] + line2)

I’ve tried like

if line2[-5:] == line1[-5:]:
new_file.write(line1[:len(line1[-5:])] + line2)

but this of course only takes first line of each "line2" and "line1", it doesn’t go through a whole .txt file which it needs to do.

Asked By: meraki_1

||

Source

Answer 1

you can split the line and have the name and number for each line then compare and combine in case it is a match:

name1, number1 = line1.split(" ")
name2, number2 = line2.split(" ")
if number2 == number1:
    new_file.write(f"{name1} {name2} {number2}")

new code:

new = []
with open('full.txt', 'w') as new_file:
    with open('file1.txt') as fp_first_name:
        for line1 in fp_first_name:
            with open('file2.txt') as fp_last_name:
                for line2 in fp_last_name:
#                    print(f"L1: {line1}L2: {line2}")
                    name1, number1 = line1.split(" ")
                    name2, number2 = line2.split(" ")
#                    print(f"what {name1} {number1} {name2} {number2}")
                    if number2.strip() == number1.strip():
                        new_file.write(f"{name1} {name2} {number2}")

Answered By: A. Herlas

Joining two large disk .txt files on ID number if they are separated by newline character?

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