Reading a text file into a list in Python
This tutorial will examine various methods for loading or reading text files into Python lists. It includes using the function open()on the file object returned by read().split()the function, NumPythe library's loadtxtfunction, and csv.readerthe function to load a text file and split it into separate elements in a list.
Read a text file into a list in Python using the file object returned read().split()by the functionopen()
The code example given below shows how we can first openread a text file using and then read().split()split it into an ,array with as the delimiter using function.
Assume that the content of the text file file.txtis as follows.
1,2,321,355,313
Code:
with open("file.txt", "r") as tf:
lines = tf.read().split(",")
for line in lines:
print(line)
Output:
1
2
321
355
313
split()The argument to the function, in this case ,, specifies the delimiter in the text file.
Read a text file into a list
in Python using NumPythe library'sloadtxt
The code example given below shows how we can use the function NumPyof the library loadtxtto load a text file and delimitersplit it into an array using the parameter.
from numpy import loadtxt
lines = loadtxt("file.txt", delimiter=",")
for line in lines:
print(line)
Output:
1.0
2.0
321.0
355.0
313.0
csv.reader()Read a text file into a list
using the function in Python
csvThe module is usually used to process CSV files, but can also be used to process text files.
csvThe module's readerfunction reads the given file and returns a _csv.readerobject. We can convert the object into a list by applying list()the function _csv.reader.
Note that even though the file has only one line, the converted list is a 2D array; therefore, we need to use indexing [0]to get the 1D list.
import csv
with open("file.txt") as f:
line = csv.reader(f, delimiter=",")
print(list(line)[0])
Output:
['1', '2', '321', '355', '313']
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