List Archives - Technology Trekking

Many a times we need to store list in a file for later usage, in such cases, its better to store list in a file and read this file into list whenever we need to use. Python has very easy methods for achieving this.

################################################################################################

# name: list_to_file_01.py

# desc: 

# date: 2019-03-30

# Author: conquistadorjd

################################################################################################

print('*** Program Started ***')

score = ["one","two","three", "four"]

with open("list_to_file.txt", "w") as f_write:

    for s in score:

        f_write.write(str(s) +",")

with open("list_to_file.txt", "r") as f_read:

	lines = f_read.read().split(',')

	print('lines : ', lines )

	print('type of lines : ', type(lines) )		

	for line in lines:

		print("line : ", line)

print('*** Program Completed ***')

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list_to_file_01.py
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Output of the program

*** Program Started ***
lines : ['one', 'two', 'three', 'four', '']
type of lines : <class 'list'>
line : one
line : two
line : three
line : four
line :
*** Program Completed ***

file generated is as below

one,two,three,four,

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list_to_file.txt
hosted with ❤ by GitHub

Here is another version of same program

################################################################################################

# name: list_to_file_02.py

# desc: 

# date: 2019-03-30

# Author: conquistadorjd

################################################################################################

print('*** Program Started ***')

score = ["one","two","three", "four"]

f_write = open("list_to_file.txt", "w")

for s in score:

    f_write.write(str(s) +",")

# Expkicite close is needed in this case

f_write.close()

f_read = open("list_to_file.txt", "r")

lines = f_read.read().split(',')

print('lines : ', lines )

print('type of lines : ', type(lines) )		

for line in lines:

	print("line : ", line)

## This close can be ommited considering program termination closes all open files.

f_read.close()

print('*** Program Completed ***')

view raw
list_to_file_02.py
hosted with ❤ by GitHub

output and file generated is same except file opening closing styles are different.