How To Read Data From A File In Python 2.7 For Absolute Beginner On Windows 10 And Mac OS Sierra #31
How To Read Data From A File In Python 2.7
Reading and Writing Files in Python
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When you’re working with Python, you don’t need to import a library in order to read and write files. It’s handled natively in the language, albeit in a unique manner.
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The first thing you’ll need to do is use Python’s built-in open function to get a file object.
The open function opens a file. It’s simple.
When you use the open function, it returns something called a file object. File objects contain methods and attributes that can be used to collect information about the file you opened. They can also be used to manipulate said file.
For example, the mode attribute of a file object tells you which mode a file was opened in. And the name attribute tells you the name of the file that the file object has opened.
You must understand that a file and file object are two wholly separate – yet related – things.
How to Create a Text File
With Python you can create a .text files (text.txt) by using the code, we have demonstrated here how you can do this
Step 1)
f= open("text.txt","w+")
We declared the variable f to open a file named text.txt. Open takes 2 arguments, the file that we want to open and a string that represents the kinds of permission or operation we want to do on the file
Here we used "w" letter in our argument, which indicates write and the plus sign that means it will create a file if it does not exist in library
The available option beside "w" are "r" for read and "a" for append and plus sign means if it is not there then create it
Step 2)
for i in range(10):
f.write("This is line %d\r\n" % (i+1))
We have a for loop that runs over a range of 10 numbers.
Using the write function to enter data into the file.
The output we want to iterate in the file is "this is line number", which we declare with write function and then percent d (displays integer)
So basically we are putting in the line number that we are writing, then putting it in a carriage return and a new line character
Step 3)
f.close()
This will close the instance of the file text.txt stored
Summary
Python allows you to read, write and delete files.
Use the function open("filename","w+") to create a file. ...
To append data to an existing file use the command open("Filename", "a")
Use the read function to read the ENTIRE contents of a file.
Use the readlines function to read the content of the file one by one.
Python is an interpreted high-level programming language for general-purpose programming. Created by Guido van Rossum and first released in 1991, Python has a design philosophy that emphasizes code readability, notably using significant white space. It provides constructs that enable clear programming on both small and large scales. In July 2018, Van Rossum stepped down as the leader in the language community after 30 years.
Python features a dynamic type system and automatic memory management. It supports multiple programming paradigms, including object-oriented, imperative, functional and procedural, and has a large and comprehensive standard library.
Python interpreters are available for many operating systems.
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