#9 Python Tutorial for Beginners

 Hello Guys,

   In previous tutorial you learned about function , types of function , function with argument , default parameter value and recursion.

In this tutorial you will learn below points:

• Types of file
• Opening a file
• reading file in python
• readline() function
• writing files in python
• mode of opening file
• with statement

            

Let's get started.

   The RAM  is volatile and all it's contents are lost once program are terminates. In order to persist the data forever , we use files. 

   

    A file is data stored in a storage device. A python program can talk to the file by reading the content from it and writing on it.

Types of file

• There are two types of file.

             1. Text file (.txt , .c)

             2.  Binary file (.jpg  , .dat)

  

Opening a file

• Python has an open() for opening files. It takes 2 parameter: file_name and mode.

Syntax :

               open("sample.txt", 'r')

• sample.txt is file name and 'r' is file mode.

Reading file in python

• read() function is used to read content from specify a file in python.

Example :

# Use open function to open the file # By default it contain the r mode # for reading the file f1 = open('sample.txt' , 'r') data = f1.read() print(data) f1.close()

 

readline( ) function

• readline( ) function is used to read full line at a time.

Example :

#readline function is used to read on full line at time # read the first line f = open('sample.txt') data = f.readline() print(data) # read the second line data = f.readline() print(data) # read the third line data = f.readline() print(data)

Writing files in python

• write( ) function is used to write into the file.

Example :

f = open('another.txt' , 'w') f.write("Hello I am here") f.close()

Mode of opening file

• r is open for reading.
• w is open for writing.
• a is open for appending.

• rb will be open for read in binary mode.

With statement

• with statement is used to open and close the file automatically.

Example :

# with statement is used to open and close file automatically. with open('sample.txt' , 'r') as f: a = f.read() with open('sample.txt' , 'w') as f: a = f.write("I am here always") print(a)

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