How can i delete specific numbers from a file?

Question

I'm trying to delete whole specific lines from a text file that contains those number

1801 - 1802 - 1803 until 2000 

sample of the file like

2 1801 0.417
2 1802 0.795
2 1803 0.129
2 1804 0.852

the code I tried in one number as

with open("example.txt", "r") as f:
    lines = f.readlines()
with open("yo.txt", "w") as f:
    for line in lines:
        if line.strip("\n") != "1801":
            f.write(line)

but didn't work and doesn't affect on the file

Answer 1

You are checking if the line is 1801. You should check if 1801 is in the line.

You should use if '1801' in line:

Since you need to check for any number between 1801 and 2000, you need to use a range. The numbers are going to be integers in the range. So convert them to string before you check.

EDIT Ver 2: Read & Write to file:

with open("abc.txt", "r") as f_in, open("out.txt", "w") as f_out:
    for line in f_in:
        if not any(str(i) in line.strip() for i in range(1801, 2001)):
            f_out.write(line)

Input file:

2 1801 0.417 # do not write to output file
2 1802 0.795 # do not write to output file
2 1750 0.234 # write to output file
2 1803 0.129 # do not write to output file
2 1779 0.123 # write to output file
2 1804 0.852 # do not write to output file
2 1760 0.345 # write to output file

Output File:

2 1750 0.234 # write to output file
2 1779 0.123 # write to output file
2 1760 0.345 # write to output file

EDIT Ver 1: Concept logic

Try this. Instead of a file, I am just putting the whole data into a string and processing. Let me know if you want a full file read and write implementation.

sample_data = '''2 1801 0.417
2 1802 0.795
2 1750 0.234
2 1803 0.129
2 1779 0.123
2 1804 0.852
2 1750 0.345'''

for line in sample_data.split('\n'):
    if not any(str(i) in line for i in range(1801, 2001)):
        print ('written to file - line :',line)
    else:
        print ('skipped line ',line)

The output of this will be:

skipped line  2 1801 0.417
skipped line  2 1802 0.795
written to file - line : 2 1750 0.234
skipped line  2 1803 0.129
written to file - line : 2 1779 0.123
skipped line  2 1804 0.852
written to file - line : 2 1750 0.345