Author: John Au-Yeung

Sometimes, we want to use named tuples in Python.

In this article, we’ll look at how to use named tuples in Python.

How to use named tuples in Python?

To use named tuples in Python, we can use the namedtuple function from the collections module.

For instance, we write:

from collections import namedtuple
from math import sqrt

Point = namedtuple('Point', 'x y')
pt1 = Point(1.0, 5.0)
pt2 = Point(2.5, 1.5)

line_length = sqrt((pt1.x - pt2.x)**2 + (pt1.y - pt2.y)**2)

print(line_length)

We call namedtuple with the class name and the attributes of the named tuple.

We assign the returned class to Point.

Then we can create Point instances by passing in the values for x and y respectively.

Next, we call sqrt with (pt1.x - pt2.x)**2 + (pt1.y - pt2.y)**2 to calculate the Euclidean distance between pt1 and pt2.

And so line_length is 3.8078865529319543.

Conclusion

To use named tuples in Python, we can use the namedtuple function from the collections module.

Sometimes, we want to delete a file or folder in Python.

In this article, we’ll look at how to delete a file or folder in Python.

How to delete a file or folder in Python?

To delete a file or folder in Python, we can use the os.remove method.

For instance, we write:

import os

os.remove("data.txt")

We call os.remove with the path of the file or folder to remove.

Conclusion

To delete a file or folder in Python, we can use the os.remove method.

Sometimes, we want to check if all elements in a list are identical in Python.

In this article, we’ll look at how to check if all elements in a list are identical in Python.

How to check if all elements in a list are identical in Python?

To check if all elements in a list are identical in Python, we can convert the list to a set and check whether the set’s length is 1 or shorter.

For instance, we write:

the_list = [1, 1, 1, 1, 1]

all_same = len(set(the_list)) <= 1
print(all_same)

We define the the_list list with all 1’s.

Then we call set with the_list to convert it to a set.

Next, we get the length of the set with len.

And we check that the set’s length is 1 or less than return that.

Finally, we assign the result to all_same.

Therefore, all_same is True.

Conclusion

To check if all elements in a list are identical in Python, we can convert the list to a set and check whether the set’s length is 1 or shorter.

Sometimes, we want to find the similarity metric between two strings with Python.

In this article, we’ll look at how to find the similarity metric between two strings with Python.

How to find the similarity metric between two strings with Python?

To find the similarity metric between two strings with Python, we can use the difflib module.

For instance, we write:

from difflib import SequenceMatcher


def similar(a, b):
    return SequenceMatcher(None, a, b).ratio()


s = similar("Apple", "Apelp")
print(s)

We define the similar that takes 2 strings a and b.

In the function, we create the SequenceMatcher instance with the 2 strings.

And we call ratio to return the similarly ratio between a and b.

Then we call similar with 2 strings and assign the returned result to s.

Therefore, s is 0.6.

Conclusion

To find the similarity metric between two strings with Python, we can use the difflib module.

Sometimes, we want to read a text file into a string variable and strip newlines with Python.

In this article, we’ll look at how to read a text file into a string variable and strip newlines with Python.

How to read a text file into a string variable and strip newlines with Python?

To read a text file into a string variable and strip newlines with Python, we can open the file with open.

Then we read the opened file with read into a string.

And then we call the string’s replace method to replace the new lines.

For instance, we write:

with open('data.txt', 'r') as file:
    data = file.read().replace('\n', '')
    print(data)

to open the file with open by calling it with the path and the 'r' read permission to read the file.

Then we call the opened file‘s read method to read the file into a string.

And finally, we call replace with '\n' and '' to replace the newline characters with empty strings and assign the returned strings with data.

Therefore, data is 'foobarbaz' if data.txt has:

foo
bar
baz

Conclusion

To read a text file into a string variable and strip newlines with Python, we can open the file with open.

Then we read the opened file with read into a string.

And then we call the string’s replace method to replace the new lines.