File IO¶

In [1]:
!type data.txt

Hello, world!
I like Python.
In [2]:
[s for s in open('data.txt',encoding='utf-8')]
Out[2]:
['Hello, world!\n', 'I like Python.\n']
In [3]:
f=open('outdata.txt','w')

for i in range(10):
    f.write(f'This is line {i}\n')

f.close()
In [4]:
!type outdata.txt

This is line 0
This is line 1
This is line 2
This is line 3
This is line 4
This is line 5
This is line 6
This is line 7
This is line 8
This is line 9
In [5]:
for s in open('outdata.txt'):
    print(s)

This is line 0

This is line 1

This is line 2

This is line 3

This is line 4

This is line 5

This is line 6

This is line 7

This is line 8

This is line 9