Questions
Find answers to frequently asked development questions. For information about Better Stack products, explore our docs.
What is the difference between venv, pyvenv, pyenv, virtualenv, virtualenvwrapper, pipenv, etc.
venv, pyvenv, and pyenv are all tools that can be used to create isolated Python environments. virtualenv and virtualenvwrapper are similar tools that can also create isolated Python environments. ...
How do I check if a string represents a number in Python?
To check if a string represents a number (float or int) in Python, you can try casting it to a float or int and check if the cast was successful. If the string can't be cast, then it is not a numbe...
How Do I Measure Elapsed Time in Python?
There are several ways to measure elapsed time in Python. Here are a few options: You can use the time module to get the current time in seconds since the epoch (the epoch is a predefined point in ...
How do I append to a file in Python?
To append to a file in Python, you can use the "a" mode in the open() function. This will open the file in append mode, which means that you can write new data at the end of the file. Here is an ex...
How do I remove a trailing newline in Python?
You can use the rstrip() method to remove a trailing newline from a string. Here is an example: s = "Hello, World!\n" s = s.rstrip() print(s) This will print "Hello, World!" (without the newline). ...
How to check if the string is empty in Python?
To check if a string is empty in Python, you can use the len() function. For example: string = "" if len(string) == 0: print("The string is empty") You can also use the not operator to check if...
How do I pad a string with zeroes in Python?
You can pad a string with zeros in Python by using the zfill() method. This method adds zeros to the left of the string until it reaches the specified length. Here's an example: s = '123' padded = ...
How to read a file line-by-line in Python?
To read a file line-by-line in Python, you can use the following approach: with open('file.txt') as f: for line in f: print(line) This will open the file, read each line in the file, an...
How to delete an element from a dictionary in Python?
To delete an element from a dictionary in Python, you can use the del statement. For example: mydict = {'a': 1, 'b': 2, 'c': 3} del mydict['b'] print(my_dict) # {'a': 1, 'c': 3} This will remove t...
How do I count the occurrences of a list item in Python?
You can use the count() method of a list to count the number of occurrences of an item in the list. For example: mylist = ['a', 'b', 'a', 'c', 'a'] print( mylist.count('a') ) # 3 This will return 3...
How to determine the type of an object in Python?
You can use the type() function to determine the type of an object in Python. For example: x = 10 print(type(x)) # Output: <class 'int'> y = "hello" print(type(y)) # Output: <class 'str'> z = [1,...
How to run Python code on Android?
There are several ways to run Python code on an Android device: Use an Android app that can run Python code, such as QPython, PyDroid, or Python for Android. These apps typically include a built-in...
How to remove an element from a list by index in Python?
To remove an element from a list by index in Python, you can use the del statement. Here is an example: a = [1, 2, 3, 4, 5] del a[2] print(a) # [1, 2, 4, 5] The del statement removes the element at...
How do I get the number of elements in a list (length of a list) in Python?
To get the number of elements in a list in Python, you can use the len() function. For example, if you have a list my_list, you can get its length using len(my_list). Here's an example: mylist = [1...
How to limit floats to X decimal points in Python?
There are a few different ways to limit the number of decimal places for a float in Python. Here are three options: Use the round() function: x = 3.14159265 rounded = round(x, 2) # 3.14 Use string...
How do I print curly-brace characters in a string while using .format in Python?
To print a curly brace character in a string while using the .format() method in Python, you can use double curly braces {{ and }} to escape the curly braces. For example: print("{{example}}".forma...
How can I randomly select an item from a list in Python?
To randomly select an item from a list in Python, you can use the random.choice() function from the random module. This function takes a list as an argument and returns a randomly selected element ...
How to check if an object has an attribute in Python?
To check if an object has an attribute in Python, you can use the hasattr function. This function takes two arguments: the object and the attribute name as a string. It returns True if the object h...
Importing files from different folder in Python?
In Python, you can use the import statement to import modules or files from different folders. If the file you want to import is in a different folder than the script you are running, you will need...
How to leave/exit/deactivate a Python virtualenv?
To leave a Python virtual environment, you can use the deactivate command. This will return you to the system's default Python environment. Here's an example of how you would use deactivate: source...
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