Write Multiple Variables to a File using Python

Storing multiple variables in a file is a common task in programming, especially when dealing with data persistence or configuration settings. In this article, we will explore three different approaches to efficiently writing multiple variables in a file using Python. Below are the possible approaches to writing multiple variables to a file in Python.

• Using the repr() function
• Using the string formatting
• Using the str() function

Using the repr() function

In this approach we are using the repr() function to convert each variable into its string representation, preserving its data type andwrite them to a file named 'output.txt' in the format of variable assignments, allowing for easy reconstruction of the variables when read back from the file.

n = "GeeksforGeeks"
f = 2009
p = True

with open('output.txt', 'w') as file:
    file.write("website_name = " + repr(n) + '\n')
    file.write("founded_year = " + repr(f) + '\n')
    file.write("is_popular = " + repr(p) + '\n')

Output

website_name = 'GeeksforGeeks'
founded_year = 2009
is_popular = True

Explanation: This code writes the values of three variables n, f, p (which are website name, founded year and bool for is popular) to a file (output.txt) with their names and repr() representations.

Using the string formatting

In this approach, we are using string formatting to write multiple variables (n, f and p) to a file named 'output.txt', creating a clear and human-readable representation of the data with formatted labels and values.

n = "GeeksforGeeks"
f = 2009
p = True

with open('output.txt', 'w') as file:
    file.write("Website Name: {}\n".format(n))
    file.write("Founded Year: {}\n".format(f))
    file.write("Is Popular: {}\n".format(p))

Output

website_name = 'GeeksforGeeks'
founded_year = 2009
is_popular = True

Using the str() function

In this approach, we are using the str() function to convert each variable (n, f and p) into strings and writes them to a file named 'output.txt', presenting a proper representation of the variables with labeled values.

n = "GeeksforGeeks"
f = 2009
p = True

with open('output.txt', 'w') as file:
    file.write("Website Name: " + str(n) + '\n')
    file.write("Founded Year: " + str(f) + '\n')
    file.write("Is Popular: " + str(p) + '\n')

Output

website_name = 'GeeksforGeeks'
founded_year = 2009
is_popular = True

Related Articles:

• Python repr() Function
• Python String Formatting
• Python str() function
• Python Tutorial