Category: Python Answers

Sometimes, we want to get number closest to a given value from a list of integers with Python.

In this article, we’ll look at how to get number closest to a given value from a list of integers with Python.

How to get number closest to a given value from a list of integers with Python?

To get number closest to a given value from a list of integers with Python, we can call min with the key argument that gets the absolute difference between the target number and the numbers in the list.

For instance, we write

closest = min(my_list, key=lambda x: abs(x - my_number))

to call min with the my_list number list.

We set key to a function that gets the absolute difference between number x in my_list and my_number with

abs(x - my_number)

Then the number in my_list that’s closes to my_number will be returned.

Conclusion

To get number closest to a given value from a list of integers with Python, we can call min with the key argument that gets the absolute difference between the target number and the numbers in the list.

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 version.parse method to parse the version string into an object and compare that.

For instance, we write

from packaging import version

greater = version.parse("2.3.1") < version.parse("10.1.2")

to call version.parse with the version string.

And then we use < compare the 2 version objects.

Conclusion

To compare version numbers in Python, we can use the version.parse method to parse the version string into an object and compare that.

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 list comprehension.

For instance, we write

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

to create a datetime object with today’s date with

base = datetime.datetime.today()

Then we create the datetime list with

[base - datetime.timedelta(days=x) for x in range(num_days)]

We subtract the number of days from base to get the datetime values.

Conclusion

To create a range of dates in Python, we can use list comprehension.

Sometimes, we want to strip everything but alphanumeric chars from a string in Python.

In this article, we’ll look at how to strip everything but alphanumeric chars from a string in Python.

How to strip everything but alphanumeric chars from a string in Python?

To strip everything but alphanumeric chars from a string in Python, we can split the string and then use the isalnum method to filter out non alphanumeric characters.

For instance, we write

s = ''.join(ch for ch in some_string if ch.isalnum())

to filter out all the non-alphanumeric characters with

ch for ch in some_string if ch.isalnum()

isalnum is a string method to check if a string has all alphanumeric characters.

Then we call join to join the filtered substrings together.

Conclusion

To strip everything but alphanumeric chars from a string in Python, we can split the string and then use the isalnum method to filter out non alphanumeric characters.

Sometimes, we want to get the class name of an instance with Python.

In this article, we’ll look at how to get the class name of an instance with Python.

How to get the class name of an instance with Python?

To get the class name of an instance with Python, we can use the __name__ property.

For instance, we write

type(x).__name__

to get the __name__ attribute of the class that’s used to create variable x.

We get the class that’s used to create x with type.

How to get the class name of an instance with Python?

To get the class name of an instance with Python, we can use the __name__ property.