Suppose i have the text file:
apple
banana
fruit
how would i get that to :
1.apple
2.banana
3.fruit
Is there a way to do this in python ?
myfile=open("dates.txt","a")
for i in range(14):
myfile.write(i)
myfile.write("\n")
I use fileinput.input()
and its inplace
parameter for tasks such as this. Taking advantage of Python3.6's f-strings , here is a complete example:
import fileinput
for i, line in enumerate(fileinput.input(inplace=True), 1):
print(f'{i}.{line.rstrip()}')
Sample usage:
$ cat groceries.txt
apple
banana
fruit
$ python3 numberize.py groceries.txt
$ cat groceries.txt
1.apple
2.banana
3.fruit
$
First open your file and read each line with readlines()
to return a list of the contnse. Then initerate through your list giving a variable the number you wish to give it. Add the value of i (as a string) to the desired ., write over your existing file adding part of the list by slicing.
with open('first.txt') as pri:
a = pri.splitlines()
for i in range(1, len(a)+1):
part = str(i) + '.'
with open('first.txt', 'w') as file:
file.write(part + a[i-1])
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