How to implement Python to read files line by line [Small file and large file reading]

The example in this article describes the implementation method of reading files line by line in Python. Share it with everyone for your reference, the details are as follows:

Small file:

#coding=utf-8
#author: walker
#date: 2013-12-30
#function: 按行读取小文件
all_lines = []
try:
  file = open('txt.txt', 'r')
  all_lines = file.readlines()
except IOError as err:
  print('File error: ' + str(err))
finally:
  if 'file' in locals():
    file.close()
for line in all_lines:
  print(line)

Large file:

#coding=utf-8
#author: walker
#date: 2013-12-30
#function: 按行读取大文件
try:
  file = open('txt.txt', 'r')
  for line in file:
    print(line)
except IOError as err:
  print('File error: ' + str(err))
finally:
  if 'file' in locals():
    file.close()

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