Duncan Booth wrote:
Ben <[EMAIL PROTECTED]> wrote:
Since strings are
immutable I can't assign different values to a specific slice of the
string. How can I accomplish this?
You probably don't want to use readlines. It is almost always cleaner just
to iterate over the file itself.
You can't change an existing string, but creating a new string isn't
exactly rocket science.
lines = []
for line in F:
modified = line[:16] + "CHANGED" + line[23:]
# or maybe
modified = line.replace("1999999", "CHANGED")
lines.append(modified)
FileOut.writelines(lines)
If you want your program to scale to indefinitely large files, and you
edit each line independently, without using date from other lines, read
a line *and* write the new line immediately
for line in F:
FileOut.write(<modified>)
Where <modified> is one of the suggested expressions, or a temporary
variable calculated on multiple lines.
To edit a line 'in-place', one can use the array module for mutable
array of bytes (or the 3.0 bytearray), but I would only both with
extensive editing.
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