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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.

Sometimes, we want to convert a Python int into a binary string.

In this article, we’ll look at how to convert a Python int into a binary string.

How to convert a Python int into a binary string?

To convert a Python int into a binary string, we can use the format method.

For instance, we write

s =  "{0:b}".format(88)

to convert 88 to a binary string by calling "{0:b}".format with 88.

Conclusion

To convert a Python int into a binary string, we can use the format method.

Sometimes, we want to create new column based on values from other columns or apply a function of multiple columns, row-wise with Python Pandas.

In this article, we’ll look at how to create new column based on values from other columns or apply a function of multiple columns, row-wise with Python Pandas.

How to create new column based on values from other columns or apply a function of multiple columns, row-wise with Python Pandas?

To create new column based on values from other columns or apply a function of multiple columns, row-wise with Python Pandas, we can use the data frame apply method.

For instance, we write

import pandas as pd

df = pd.DataFrame({'a': [1, 2], 'b': [3, 4]})
df['c'] = df.apply(lambda row: row.a + row.b, axis=1)

to call df.apply with a function that adds the value from columns a and b row-wise and assign the values to column c.

Conclusion

To create new column based on values from other columns or apply a function of multiple columns, row-wise with Python Pandas, we can use the data frame apply method.