Category: Python Answers

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.

Sometimes, we want to compare a string to multiple items in Python.

In this article, we’ll look at how to compare a string to multiple items in Python.

How to compare a string to multiple items in Python?

To compare a string to multiple items in Python, we can use the in operator.

For instance, we write:

accepted_strings = ['auth', 'authpriv', 'daemon']
facility = 'auth'

if facility in accepted_strings:
    print('accepted')

We have the accepted_strings list.

Then we can use the in operator to check if facility included in the accepted_strings list.

Since this is True, 'accepted' is printed.

Conclusion

To compare a string to multiple items in Python, we can use the in operator.

Sometimes, we want to upload a file with the Python requests module.

In this article, we’ll look at how to upload a file with the Python requests module.

How to upload a file with the Python requests module?

To upload a file with the Python requests module, we can call requests.post with the URL of the endpoint to upload the file to and set the files parameter to a dictionary with the form data payload.

For instance, we write:

import requests

url = 'http://httpbin.org/post'
files = {'file': open('file.csv', 'rb')}

r = requests.post(url, files=files)
print(r.text)

We call requests.post with the url and files set to the files dictionary.

We set the file form data entry to the file handle of the file.csv file.

Then we get the response text with r.text.

Conclusion

To upload a file with the Python requests module, we can call requests.post with the URL of the endpoint to upload the file to and set the files parameter to a dictionary with the form data payload.

Sometimes, we want to import a CSV to list with Python.

In this article, we’ll look at how to import a CSV to list with Python.

How to import a CSV to list with Python?

To import a CSV to list with Python, we can call open to open the CSV and then call csv.reader to read it.

For instance, we write:

import csv

with open('file.csv', newline='') as f:
    reader = csv.reader(f)
    data = list(reader)

print(data)

We call open with the path string to the file.

Then we call csv.reader with the file handle f to read the file and return a iterator.

Then we assign the iterator to reader.

Finally, we convert the reader iterator to a list with list and assign it to data.

Therefore, data is [['This is the first line', 'Line1'], ['This is the second line', 'Line2'], ['This is the third line', 'Line3']] if file.csv has:

This is the first line,Line1
This is the second line,Line2
This is the third line,Line3

Conclusion

To import a CSV to list with Python, we can call open to open the CSV and then call csv.reader to read it.