Author: John Au-Yeung

Sometimes, we want to print everything in one line dynamically with Python.

In this article, we’ll look at how to print everything in one line dynamically with Python.

How to print everything in one line dynamically with Python?

To print everything in one line dynamically with Python, we can set the end parameter to an empty string and the sep parameter to a string with one space.

And we set flush to True.

For instance, we write:

for item in range(1, 10):
    print(item, sep=' ', end='', flush=True)

We loop through the iterator that returns 1 to 9.

Then we call print in the loop body with the options set.

We replaced new line with an empty string for the end character for each print call.

Now we should see:

123456789

printed on the screen.

Conclusion

To print everything in one line dynamically with Python, we can set the end parameter to an empty string and the sep parameter to a string with one space.

And we set flush to True.

Sometimes, we want to print number with commas as thousands separators with Python.

In this article, we’ll look at how to print number with commas as thousands separators with Python.

How to print number with commas as thousands separators with Python?

To print number with commas as thousands separators with Python, we can use the {:n} format code.

For instance, we write:

import locale

locale.setlocale(locale.LC_ALL, '')

value = 10000000

curr_1 = '{:n}'.format(value)
curr_2 = f'{value:n}'
print(curr_1)
print(curr_2)

to call locale.setlocale to set the locale.

Then we have the value that we want to format into a comma separated number.

Next, we call format with value to format the number into a comma separated number by using '{:n}' as the placeholder.

And we do the same with the f-string by passing in value before the colon.

Therefore, curr_1 and curr_2 are both 10,000,000.

Conclusion

To print number with commas as thousands separators with Python, we can use the {:n} format code.

Sometimes, we want to clear the interpreter console with Python.

In this article, we’ll look at how to clear the interpreter console with Python.

How to clear the interpreter console with Python?

To clear the interpreter console with Python, we can run the cls command if the script is run on Windows and clear otherwise.

We can do this with the os.system method.

For instance, we write:

import os

def cls():
    os.system('cls' if os.name=='nt' else 'clear')

cls()

We have the cls function that uses os.name to check for the platform that it’s running.

If os.name returns 'nt' then it’s running on Windows.

We use os.system to run cls or clear depending on the platform.

Conclusion

To clear the interpreter console with Python, we can run the cls command if the script is run on Windows and clear otherwise.

We can do this with the os.system method.

Sometimes, we want to check if a list is empty with Python.

In this article, we’ll look at how to check if a list is empty with Python.

How to check if a list is empty with Python?

To check if a list is empty with Python, we can use the not operator.

For instance, we write:

a = []
if not a:
    print("List is empty")

We put not before a to check if a is empty.

Since this is True, we see 'List is empty' printed.

This works because empty lists are falsy.

Conclusion

To check if a list is empty with Python, we can use the not operator.

Sometimes, we want to use a decimal range() step value with Python.

In this article, we’ll look at how to use a decimal range() step value with Python.

How to use a decimal range() step value with Python?

To use a decimal range() step value with Python, we can use list comprehension with range.

For instance, we write:

l = [x * 0.1 for x in range(0, 10)]
print(l)

to create a list of numbers from 0, 0.1, 0.2, … all the way to 0.9.

We create an iterator with range from 0 and 10 to create an iterator that returns 0 to 9.

And then we multiply those entries by 0.1

Therefore, l is [0.0, 0.1, 0.2, 0.30000000000000004, 0.4, 0.5, 0.6000000000000001, 0.7000000000000001, 0.8, 0.9].

Conclusion

To use a decimal range() step value with Python, we can use list comprehension with range.