Python print numbers to file

Write Float to File Using Python

To write a float to a file, you just have to open a file in write mode, convert the float to a string with str(), and use the write() function.

fl = 1.01 with open("example.txt", "w") as f: f.write(str(fl))

If you want to add a float to an existing file and append to the file, then you need to open the file in append mode.

fl = 1.01 with open("example.txt", "a") as f: f.write(str(fl))

When working with files in Python, the ability to create new files or modify existing files easily is important.

One such case is if you want to write a float to a file.

To write a float to a file, it is easy – you just have to open a file in write mode, convert the float to a string with str(), and use the write() function.

This is the same as if you wanted to write an int to a file.

Below is a simple example of how you can write a float to a file using Python.

fl = 1 with open("example.txt", "w") as f: f.write(str(fl))

Append Variable to File Using Python

If you want to append a float to a file, then you should open the file in append mode.

Below is an example showing you how to append a float to a file in Python.

fl = 1.01 with open("example.txt", "a") as f: f.write(str(fl))

How to Write Multiple Float Values to a File Using Python

If you want to write multiple float varaibles to a file using Python, you can build a string and then pass it to write().

For example, if you had multiple floats and wanted to print each one on it’s own line, then you could do the following in Python.

float1 = 1.01 float2 = 2.02 float3 = 3.03 with open("example.txt", "w") as f: f.write(str(float1) + "\n") f.write(str(float2) + "\n") f.write(str(float3) + "\n")

If you wanted to create a file where the floats were comma delimited, then you could print them all on one line and join them with a comma.

float1 = 1.01 float2 = 2.02 float3 = 3.03 with open("example.txt", "w") as f: f.write(",".join([str(float1), str(float2), str(float3)]))

Hopefully this article has been useful for you to learn how to write an float to a file in Python.

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Programming allows us to create amazing applications which make our work more efficient, repeatable and accurate.

At the end of the day, we want to be able to just push a button and let the code do it’s magic.

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Write Integer to File Using Python

To write an integer to a file, you just have to open a file in write mode, convert the int to a string with str(), and use the write() function.

integer = 1 with open("example.txt", "w") as f: f.write(str(integer))

If you want to add an integer to an existing file and append to the file, then you need to open the file in append mode.

integer = 1 with open("example.txt", "a") as f: f.write(str(integer))

When working with files in Python, the ability to create new files or modify existing files easily is important.

One such case is if you want to write an integer to a file.

To write an integer to a file, it is easy – you just have to open a file in write mode, convert the int to a string with str(), and use the write() function.

This is the same as if you wanted to write a variable to a file with the only difference being that you have to convert the int to a string.

Below is a simple example of how you can write an integer to a file using Python.

integer = 1 with open("example.txt", "w") as f: f.write(str(integer))

Append Variable to File Using Python

If you want to append an integer to a file, then you should open the file in append mode.

Below is an example showing you how to append an integer to a file in Python.

integer = 1 with open("example.txt", "a") as f: f.write(str(integer))

How to Write Multiple Int Values to a File Using Python

If you want to write multiple integer varaibles to a file using Python, you can build a string and then pass it to write().

For example, if you had multiple ints and wanted to print each one on it’s own line, then you could do the following in Python.

int1= 1 int2 = 2 int3 = 3 with open("example.txt", "w") as f: f.write(str(int1) + "\n") f.write(str(int2) + "\n") f.write(str(int3) + "\n")

If you wanted to create a file where the integers were comma delimited, then you could print them all on one line and join them with a comma.

int1= 1 int2 = 2 int3 = 3 with open("example.txt", "w") as f: f.write(",".join([str(int1), str(int2), str(int3)]))

Hopefully this article has been useful for you to learn how to write an int to a file in Python.

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About The Programming Expert

The Programming Expert is a compilation of a programmer’s findings in the world of software development, website creation, and automation of processes.

Programming allows us to create amazing applications which make our work more efficient, repeatable and accurate.

At the end of the day, we want to be able to just push a button and let the code do it’s magic.

You can read more about us on our about page.

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How to Write Integers to a File

In this article, you’ll learn how to write integers to a file in Python.

To make it more fun, we have the following running scenario:

MediTech, a pharmaceutical manufacturing company, is seeking the best way to save its drug test results. They have contacted you to provide possible solutions.

Integers to write to a file:

[32423, 30902, 28153, 31651, 36795, 28939, 26144, 21940]

💬 Question: How would we write code to save integer(s) to a file?

We can accomplish this task by one of the following options:

Method 1: Use open()

This option shows you how to create a new file and save a single integer or list of integers to a flat-text file.

Example 1 – Single Integer

nums = [32423, 30902, 28153, 31651, 36795, 28939, 26144, 21940] fp = open('nums_method_1a.txt', 'w') fp.write('<>'.format(nums[3])) fp.close()

Above, a list of integers is declared ( nums ). Then, a new flat-text file ( nums_method_01a.txt ) is created and opened in write ( w ) mode.

Next, the highlighted line uses the format() function to convert the single element ( nums[3] ) to a string and write it to the text file indicated above. Finally, fp.close() is called to close the open connection.

If successful, nums_method_01a.txt contains the following:

31651

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Python – Print to File

In this article, we shall look at some of the ways to use Python to print to file.

Method 1: Print To File Using Write()

We can directly write to the file using the built-in function write() that we learned in our file handling tutorial.

with open('output.txt', 'a') as f: f.write('Hi') f.write('Hello from AskPython') f.write('exit')

Output (Assume that output.txt is a newly created file)

[email protected]:~# python output_redirection.py Hi Hello from AskPython exit [email protected]:~# cat output.txt Hi Hello from AskPython exit

Method 2: Redirect sys.stdout to the file

Usually, when we use the print function, the output gets displayed to the console.

But, since the standard output stream is also a handler to a file object, we can route the standard output sys.stdout to point to the destination file instead.

The below code is taken from our previous article on stdin, stdout and stderr. This redirects the print() to the file.

import sys # Save the current stdout so that we can revert sys.stdou after we complete # our redirection stdout_fileno = sys.stdout sample_input = ['Hi', 'Hello from AskPython', 'exit'] # Redirect sys.stdout to the file sys.stdout = open('output.txt', 'w') for ip in sample_input: # Prints to the redirected stdout (Output.txt) sys.stdout.write(ip + '\n') # Prints to the actual saved stdout handler stdout_fileno.write(ip + '\n') # Close the file sys.stdout.close() # Restore sys.stdout to our old saved file handler sys.stdout = stdout_fileno

Output (Assume that output.txt is a newly created file)

[email protected]:~# python output_redirection.py Hi Hello from AskPython exit [email protected]:~# cat output.txt Hi Hello from AskPython exit

Method 3: Explicitly print to the file

We can directly specify the file to be printed in the call to print() , by mentioning the file keyword argument.

For example, the below snippet prints to the file output.txt .

print('Hi', file=open('output.txt', 'a')) print('Hello from AskPython', file=open('output.txt', 'a')) print('exit', file=open('output.txt', 'a'))

The file now has the three lines appended to it, and we have successfully printed to output.txt !

Using a context manager

However, this method isn’t the best way to resolve this situation, due to the repeated calls to open() on the same file. This wastes time, and we can do better!

The better way would be to explicitly use a context manager with statement, which takes care of automatically closing the file and using the file object directly.

with open("output.txt", "a") as f: print('Hi', file=f) print('Hello from AskPython', file=f) print('exit', file=f)

This gives the same result as before, appending the three lines to output.txt , but is now much faster, since we don’t open the same file again and again.

Method 4: Use the logging module

We can use Python’s logging module to print to the file. This is preferred over Method 2, where explicitly changing the file streams is not be the most optimal solution.

import logging # Create the file # and output every level since 'DEBUG' is used # and remove all headers in the output # using empty format='' logging.basicConfig(filename='output.txt', level=logging.DEBUG, format='') logging.debug('Hi') logging.info('Hello from AskPython') logging.warning('exit')

This will, by default, append the three lines to output.txt . We have thus printed to the file using logging , which is one of the recommended ways of printing to a file.

References

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