![]() How To Read a Text File Line by Line Using an Iterator in Python? Here the while tests for boolean and read line by line until we reach the end of file and line will be empty. # in python 3 print is a builtin function, soĪnother variation of reading a file with while statement and readline statement is as follows. # If the file is not empty keep reading one line Since we read one line at a time with readline, we can easily handle big files without worrying about memory problems. Here is the way to read text file one line at a time using “While” statement and python’s readline function. How To Read a Text File Line by Line Using While Statement in Python? Basically, we would use the file handler object after opening the file as argument to list() function to get all the lines as a list. We can also read all the lines of a file at once in another way. # close the file after reading the lines. # The variable "lines" is a list containing all lines in the file # use readlines to read all lines in the file And use the file handler from opening the file to read all lines using readlines() as follows. ![]() We first open the file using open() function in read only mode. Here is an example of how to use Python’s readlines. Python’s readlines function reads everything in the text file and has them in a list of lines. If you want to read all lines of a file at the same time, Python’s readlines() function is for you. How To Read all lines in a file at once? Use readlines() ![]() One easy way to read a text file and parse each line is to use the python statement “readlines” on a file object. In this tutorial, we will see 3 examples of reading a text file in Python 3. Opening a file and reading the content of a file is one of the common things you would do while doing data analysis.
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