2. Files operations

2.1. Files reading

file = 'file.txt'

2.2. Reading line by line

with open(r'../plik.txt') as file_descriptor:
    lines = file_descriptor.readlines()

2.3. Saving

with open(r'/tmp/iris.csv', mode='w') as file_descriptor:
    file_descriptor.write('hello')

2.4. Context manager

with open(r'plik.txt') as file_descriptor:
     for linia in file_descriptor:
         print(linia)