Question

Similar question to alternative of “grep” in python; but the complexity here is what is grepped is variable (lines) from another file. I cannot figure out how to do this using functions like re.findall()

file1:

1  20  200
1  30  300

file2:

1  20  200  0.1  0.5
1  20  200  0.3  0.1
1  30  300  0.2  0.6
1  40  400  0.9  0.6
2  50  300  0.5  0.7

Each line from file1 is my pattern; and I need to search such pattern from file2.
Then result should be:

    1  20  200  0.1  0.5
    1  20  200  0.3  0.1
    1  30  300  0.2  0.6

I’ve been trying to solve the problem using either bash or python,but cannot figure out.
thx

Answer 1

Here’s a non-regex based solution:

with open('/tmp/file1') as f:
  lines1 = f.readlines()

with open('/tmp/file2') as f:
  for line in f:
    if any(line.startswith(x.strip()) for x in lines1):
      print line,