How do I edit a text file in Python?

Question

text = open(\'samiam.txt\', \'r+\')
keyword = \" i \"
keyword2 = \"-i-\"
replacement = \" I \"
replacement2 = \"-I-\"

for line in text:    
    if keyword in line:
             


        

Answer 1

It is because you are trying to read and write at the same time. Try something like:

# Read operation
lines = []
for line in text.readlines():
    if keyword in line:
        lines.append(line.replace(keyword, replacement))
        print line
    elif keyword2 in line:
        lines.append(line.replace(keyword2, replacement2))
        print line
    else:
        lines.append(line)
        print line
text.close()

# Write operation
text = open('dummy.py', 'w+')
text.writelines(lines)
text.close()

Bonus:

with open('data.txt') as f:
     data = f.read()

is more pythonic.