Author: John Au-Yeung

Sometimes, we want to copy a string to the clipboard with Python.

In this article, we’ll look at how to copy a string to the clipboard with Python.

How to copy a string to the clipboard with Python?

To copy a string to the clipboard with Python, we can use the pyperclip package.

To install it, we run:

pip install pyperclip

Then we use it by writing:

import pyperclip

pyperclip.copy("your string")

We can paste the content of the clipboard with:

clipboard_content = pyperclip.paste()

Conclusion

To copy a string to the clipboard with Python, we can use the pyperclip package.

Sometimes, we want to concatenate text files in Python.

In this article, we’ll look at how to concatenate text files in Python.

How to concatenate text files in Python?

To concatenate text files in Python, we can use the with statement and the open function.

For instance, we write:

filenames = ['file1.txt', 'file2.txt']
with open('file.txt', 'w') as outfile:
    for fname in filenames:
        with open(fname) as infile:
            for line in infile:
                outfile.write(line)

We have the filenames list that has the paths of the files we want to join together.

Then we call open with the file we want to write the combined file contents to.

In the with block, we have a for loop to loop through the filenames and open each fname entry with open.

Then we loop through each line of each open file and call outfile.write to write each line in the input files.

Conclusion

To concatenate text files in Python, we can use the with statement and the open function.

Sometimes, we want to iterate over files in a given directory with Python.

In this article, we’ll look at how to iterate over files in a given directory with Python.

How to iterate over files in a given directory with Python?

To iterate over files in a given directory with Python, we can use the os.listdir method.

For instance, we write:

import os

directory = os.fsencode('./')

for file in os.listdir(directory):    
    filename = os.fsdecode(file)
    if filename.endswith(".py"):
        print(os.path.join(directory.decode('utf-8'), filename))

We call os.fsencode with the directory string to create the directory byte string.

Then we call os.listdir with directory to loop through the entries in the directory.

Then we call os.fsdecode with file to get the filename of the file.

And then we call os.path.join with path segment strings to print the full path of each file.

Conclusion

To iterate over files in a given directory with Python, we can use the os.listdir method.

Sometimes, we want to catch multiple exceptions in one line with Python.

In this article, we’ll look at how to catch multiple exceptions in one line with Python.

How to catch multiple exceptions in one line with Python?

To catch multiple exceptions in one line with Python, we can separate the exceptions we want to catch with commas.

For instance, we write:

try:
    raise ValueError('Represents a hidden bug, do not catch this')
    raise TypeError('This is the exception you expect to handle')
except (ValueError, TypeError) as e:
    print(repr(e))

We catch both ValueError and TypeError with one except clause.

And we get the exception content with e.

Conclusion

To catch multiple exceptions in one line with Python, we can separate the exceptions we want to catch with commas.

Sometimes, we want to find and replace elements in a list with Python.

In this article, we’ll look at how to find and replace elements in a list with Python.

How to find and replace elements in a list with Python?

To find and replace elements in a list with Python, we can use list comprehension.

For instance, we write:

a = [1, 2, 3, 1, 3, 2, 1, 1]
b = [100 if x == 1 else x for x in a]
print(b)

We have list a and we want to replace all the 1’s with 100.

To do this, we write [100 if x == 1 else x for x in a].

We check if x is 1 where x is each entry in a.

We put 100 in the returned array if x is 1. Otherwise, we put x in the array.

Then we assign the returned array to b.

Therefore b is [100, 2, 3, 100, 3, 2, 100, 100].

Conclusion

To find and replace elements in a list with Python, we can use list comprehension.