Category: Python

Sometimes, we want to check for valid email address with Python.

In this article, we’ll look at how to check for valid email address with Python.

How to check for valid email address with Python?

To check for valid email address with Python, we can use a regex and the regex search method to check whether a string is a valid email string.

For instance, we write:

import re


def valid_email(email):
    return bool(re.search(r"^[\w\.\+\-]+\@[\w]+\.[a-z]{2,3}$", email))


print(valid_email('abc@abc.com'))
print(valid_email('abc'))

to define the valid_email function to check if email is a valid email address.

We check for the characters before the @ with ^[\w\.\+\-]+. The pattern matches dots and words.

And we check for @ with \@

We check for characters after the @ with [\w]+\.[a-z]{2,3}$. The pattern matches dots and words with the domain suffix at the end.

Therefore, we should see:

True
False

printed since we have a valid and an invalid email string respectively.

Conclusion

To check for valid email address with Python, we can use a regex and the regex search method to check whether a string is a valid email string.

Sometimes, we want to expand tuples into arguments with Python.

In this article, we’ll look at how to expand tuples into arguments with Python.

How to expand tuples into arguments with Python?

To expand tuples into arguments with Python, we can use the * operator.

For instance, we write:

def add(a, b, c):
    return a + b + c


res = add(*(1, 2, 3))
print(res)

to unpack the tuple (1, 2, 3) with * as the arguments of add.

Therefore, a is 1, b is 2, and c is 3.

And res is 6.

Conclusion

To expand tuples into arguments with Python, we can use the * operator.

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

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

How to create a range of dates in Python?

To create a range of dates in Python, we can use the datetime module with list comprehension.

For instance, we write:

import datetime

base = datetime.datetime.today()
date_list = [base - datetime.timedelta(days=x) for x in range(10)]
print(date_list)

We call datetime.datetime.today to get today’s `date and time.

Then we compute the date from 9 days before today to today by using base - datetime.timedelta(days=x) for x in range(10).

And then we put the values into a list.

Therefore, date_list is:

[datetime.datetime(2021, 10, 24, 19, 15, 0, 832006), datetime.datetime(2021, 10, 23, 19, 15, 0, 832006), datetime.datetime(2021, 10, 22, 19, 15, 0, 832006), datetime.datetime(2021, 10, 21, 19, 15, 0, 832006), datetime.datetime(2021, 10, 20, 19, 15, 0, 832006), datetime.datetime(2021, 10, 19, 19, 15, 0, 832006), datetime.datetime(2021, 10, 18, 19, 15, 0, 832006), datetime.datetime(2021, 10, 17, 19, 15, 0, 832006), datetime.datetime(2021, 10, 16, 19, 15, 0, 832006), datetime.datetime(2021, 10, 15, 19, 15, 0, 832006)]

Conclusion

To create a range of dates in Python, we can use the datetime module with list comprehension.

Sometimes, we want to calculate the date six months from the current date using the datetime Python module.

In this article, we’ll look at how to calculate the date six months from the current date using the datetime Python module.

How to calculate the date six months from the current date using the datetime Python module?

To calculate the date six months from the current date using the datetime Python module, we can use the relativetimedelta function.

For instance, we write:

from datetime import date
from dateutil.relativedelta import relativedelta

six_months = date(2020, 1, 1) + relativedelta(months=+6)
print(six_months)

We call date to create a date object.

Then we add 6 months to the date and return the new date with + relativedelta(months=+6).

And then we assign the sum to six_months.

Therefore, six_months is 2020-07-01.

Conclusion

To calculate the date six months from the current date using the datetime Python module, we can use the relativetimedelta function.

Sometimes, we want to compare version numbers in Python.

In this article, we’ll look at how to compare version numbers in Python.

How to compare version numbers in Python?

To compare version numbers in Python, we can use the packaging module.

We can install it with:

pip install packaging

For instance, we write:

from packaging import version

is_less = version.parse("2.3.1") < version.parse("10.1.2")
print(is_less)

We call version.parse with the version strings.

And then we can compare the parsed version objects with the usual comparison operators.

Therefore, is_less is True.

Conclusion

To compare version numbers in Python, we can use the packaging module.