Author: John Au-Yeung

Sometimes, we want to fill out a Python string with spaces.

In this article, we’ll look at how to fill out a Python string with spaces.

How to fill out a Python string with spaces?

To fill out a Python string with spaces, we can use the ljust method.

For instance, we write:

s = 'hi'.ljust(10)
print(s)

to call ljust on 'hi' to fill the string with spaces until its length is 10.

Therefore, s is 'hi '.

Conclusion

To fill out a Python string with spaces, we can use the ljust method.

Sometimes, we want to write to an Excel spreadsheet with Python.

In this article, we’ll look at how to write to an Excel spreadsheet with Python.

How to write to an Excel spreadsheet with Python?

To write to an Excel spreadsheet with Python, we can use the Pandas DataFrame’s to_excel method.

We’ve to install the openpyxl in addition to Pandas.

To install it, we run:

pip install openpyxl

For instance, we write:

from pandas import DataFrame

l1 = [1, 2, 3, 4]
l2 = [1, 2, 3, 4]
df = DataFrame({'Stimulus Time': l1, 'Reaction Time': l2})
df.to_excel('test.xlsx', sheet_name='sheet1', index=False)

We have 2 lists l1 and l2.

Then we create a DataFrame with the DataFrame constructor.

We pass in a dictionary with l1 and l2 as values as the argument.

Next, we call to_excel with the file path of the file to write to, we set the sheet_name‘s title.

Conclusion

To write to an Excel spreadsheet with Python, we can use the Pandas DataFrame’s to_excel method.

We’ve to install the openpyxl in addition to Pandas.

Sometimes, we want to check file size in Python.

In this article, we’ll look at how to check file size in Python.

How to check file size in Python?

To check file size in Python, we can use the os.path.getsize method.

For instance, we write:

import os

b = os.path.getsize("file.txt")
print(b)

We call os.path.getsize with the file path of the file to get the size of.

Therefore b is a number in bytes.

Conclusion

To check file size in Python, we can use the os.path.getsize method.

Sometimes, we want to iterate through a range of dates in Python.

In this article, we’ll look at how to iterate through a range of dates in Python.

How to iterate through a range of dates in Python?

To iterate through a range of dates in Python, we can use the datetime module and a while loop.

For instance, we write:

from datetime import date, timedelta

start_date = date(2021, 1, 1)
end_date = date(2021, 2, 1)
delta = timedelta(days=1)
while start_date <= end_date:
    print(start_date.strftime("%Y-%m-%d"))
    start_date += delta

We create the start_date and end_date objects with the date function.

Then we call timedelta with the magnitude of the time difference we want to increment by.

Next, we use a while loop to loop through the dates and print the dates as strings with striftime.

And then we update start_date by adding timedelta to it.

Therefore, we get:

2021-01-01
2021-01-02
2021-01-03
2021-01-04
2021-01-05
2021-01-06
2021-01-07
2021-01-08
2021-01-09
2021-01-10
2021-01-11
2021-01-12
2021-01-13
2021-01-14
2021-01-15
2021-01-16
2021-01-17
2021-01-18
2021-01-19
2021-01-20
2021-01-21
2021-01-22
2021-01-23
2021-01-24
2021-01-25
2021-01-26
2021-01-27
2021-01-28
2021-01-29
2021-01-30
2021-01-31
2021-02-01

printed.

Conclusion

To iterate through a range of dates in Python, we can use the datetime module and a while loop.

Sometimes, we want to read a file in reverse order with Python.

In this article, we’ll look at how to read a file in reverse order with Python.

How to read a file in reverse order with Python?

To read a file in reverse order with Python, we can use the file_read_backwards module.

To install it, we run:

pip install file_read_backwards

Then we write:

from file_read_backwards import FileReadBackwards

with FileReadBackwards("file.txt", encoding="utf-8") as frb:
    for l in frb:
        print(l)

to read the file.txt file backwards.

We pass in the file path and the encoding as arguments for the FileReadBackwards constructor.

Then we loop through the iterator with the lines returned.

Therefore, is file.txt has

foo
bar
baz

Then we get:

baz
bar
foo

Conclusion

To read a file in reverse order with Python, we can use the file_read_backwards module.