Read a file line by line in Python Program


Reading a file and processing it line by line is the most memory-efficient way, especially when the file is too huge, in the four below Python programs we will see how to read a file line by line,

Example 1:
file_name = "sample-file.txt";

with open(file_name) as sample_file:
   line = sample_file.readline()

   while line:
       line = sample_file.readline()
       print(line.strip())
Example 2:
file_name = "sample-json-file.txt";

with open(file_name) as myFile:
    for line in myFile:
        print(line.rstrip())
Example 3:

If memory is not a concern, you can read the whole file in memory and store it as a list,

# Reading file line-by-line in 
# memory at once
file_name = "sample-json-file.txt";

with open(file_name) as myFile:
    lines = myFile.readlines()

for line in lines:
  print(line.rstrip())
Example 4: using tuple()
lines = tuple(open("sample-json-file.txt", 'r'))

for line in lines:
  print(line.rstrip())
Content of file - Python Example
Content of file - Python Example
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