How To Refer A Certain Place In A Line In Python

I have this little piece of code: g = open('spheretop1.stl', 'r') m = open('morelinestop1.gcode', 'w') searchlines = g.readlines() file = '' for i, line in enumerate(searchlines):

Solution 1:

I would use regular expressions. Live example.

import re

X1 = 206.9799
Y1 = 0.1218346for i, line inenumerate(lines):
    r = re.match(r'^\s*vertex (\d+\.\d+e[-+]\d+) (\d+\.\d+e[-+]\d+) \d+\.\d+e[-+]\d+\s*$', line)
    if r and X1 == float(r.group(1)) and Y1 == float(r.group(2)):
        m.write("start" + "\n") 

Be aware that comparing floats can be imprecise. You have to decide how much imprecision you're willing to accept when comparing values. You can use a function like this to compare two floats within a certain amount of precision.

defisclose(a, b, rel_tol=1e-09, abs_tol=0.0):
     returnabs(a-b) <= max(rel_tol * max(abs(a), abs(b)), abs_tol)