Category: Python Answers

Sometimes, we want to search a list of dictionaries with Python.

In this article, we’ll look at how to search a list of dictionaries with Python.

How to search a list of dictionaries with Python?

To search a list of dictionaries with Python, we can use the next function.

For instance, we write

dicts = [
    {"name": "jane", "age": 10},
    {"name": "mark", "age": 5},
    {"name": "john", "age": 7},
    {"name": "alex", "age": 12},
]

next(item for item in dicts if item["name"] == "jane")

to call next with an the items returned by the item for item in dicts if item["name"] == "jane" list to get the first item in dicts that has the dict entry with key name set to 'jane'.

Conclusion

To search a list of dictionaries with Python, we can use the next function.

Sometimes, we want to save plot to image file instead of displaying it using Python Matplotlib.

In this article, we’ll look at how to save plot to image file instead of displaying it using Python Matplotlib.

How to save plot to image file instead of displaying it using Python Matplotlib?

To save plot to image file instead of displaying it using Python Matplotlib, we can use the savefig method.

For instance, we write

from matplotlib import pyplot as plt

plt.savefig('foo.png')

to call savefig to save the plot to foo.png.

Conclusion

To save plot to image file instead of displaying it using Python Matplotlib, we can use the savefig method.

Sometimes, we want to search for a string in text files with Python.

In this article, we’ll look at how to search for a string in text files with Python.

How to search for a string in text files with Python?

To search for a string in text files with Python, we can open the file and then use the in operator to search for its content.

For instance, we write

with open('example.txt') as f:
    if 'hello' in f.read():
        print("found")

to open the example.txt file with open.

And then we call read to read the file into a string.

Then we check if 'hello' is in the string with in.

Conclusion

To search for a string in text files with Python, we can open the file and then use the in operator to search for its content.

Sometimes, we want to use a variable inside a regular expression with Python.

In this article, we’ll look at how to use a variable inside a regular expression with Python.

How to use a variable inside a regular expression with Python?

To use a variable inside a regular expression with Python, we can create regex string with rf.

For instance, we write

if re.search(rf"\b(?=\w){re.escape(TEXTO)}\d{{2}}\b(?!\w)", subject, re.IGNORECASE):
    print("match")

to call re.search with the rf"\b(?=\w){re.escape(TEXTO)}\d{{2}}\b(?!\w)" regex string.

We interpolate the string returned by re.escape(TEXTO) in the string.

And we use the string to look for pattersn with the TEXTO value and 2 digits.

Conclusion

To use a variable inside a regular expression with Python, we can create regex string with rf.

Sometimes, we want to get the current username in Python.

In this article, we’ll look at how to get the current username in Python.

How to get the current username in Python?

To get the current username in Python, we can use the getpass.getuser method.

For instance, we write

import getpass

current_user = getpass.getuser()

to call getpass.getuser to return the current user’s username.

Conclusion

To get the current username in Python, we can use the getpass.getuser method.