Python: why replace function and for loop is acting weird on my program?

Question

matcher = re.compile(r"hklay1\s+(.*?)\s+kppt1", re.DOTALL)
for i in xrange(1, 5):  
    with open("data{}.txt".format(i), "r") as f:  
        with open("nwirp{}.upw".format(i), "r") as f2:
            with open("data{}.upw".format(i), "w") as out:
                    content = matcher.findall(f.read()) 
                    print content
                    for line in f2:
                        lines = line.replace('5.0472640E-03', 'content')
                        out.write("".join(lines)) 

content in the written files should be number, but content becomes content like this

UPW: Upstream Weighting package file created on 4/12/2016 by ModelMuse version 3.6.2.0.

created in modelUtils.py

2nd line

9 -8.888000000000E+003 0 0 # Data Set 1, IUPWCB HDRY NPUPW IPHDRY
1 0 # LAYTYP
1 0 # LAYAVG
-1 -1 # CHANI
1 1 # LAYVKA
0 0 # LAYWET
INTERNAL 1.0 (FREE) 12 # HK Layer 1 Layer 1
content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content content

Could anyone please tell me what is the problem here?

Answer 1

The quotes around 'content' in the lines.replace(...).