Python

How do you find all the duplicates from a list in Python? To find all the duplicate elements from a list using Python, use the following list comprehension: 1 [x for idx, x in enumerate(original_list) if x in original_list[idx+1:] and x not in original_list[:idx]] The result from the above code will be a list of unique elements representing all the duplicate elements from the original list. Here’s an example of how this looks in your Python console: 1 2 3 >>> my_list = [1, 1, 2, 3, 3, 3] >>> [x for idx, x in enumerate(my_list) if x in my_list[idx+1:] and x not in my_list[:idx]] [1, 3] Get List Of Duplicates What if you want a list of all the duplicate entries? ...

How do you remove duplicates from a list using Python? To remove duplicate elements from a list in Python use a list comprehension to create a new list with no duplicates with this code: [x for idx, x in enumerate(original_list) if x not in original_list[idx+1:]] Here is an example demonstrating how this code works: 1 2 3 4 >>> original_list = [1, 2, 1, 3, 1, 2, 3] >>> [x for idx, x in enumerate(original_list) if x not in original_list[idx+1:]] [1, 2, 3] As you can see from the example above the result from the list comprehension produces a unique list from the original. ...

How do you increment an integer variable in Python? Many other languages use the double plus sign operator on the variable to increment by 1, but what is Python’s plus plus operator equivalent? Python does not yet (as of version 3.9) have the ++ operator. Instead to increment an integer variable in Python by 1 use the operator assignment syntax i += 1. Is There A ++ In Python? As of Python version 3.9 there is no double plus operator. This type of operation in other languages increments an integer variable by one. ...

How can you tell if a number is odd or even in Python? The easiest way to determine if a number is even or odd in Python is to use the modulus operator. This operator, denoted as the percentage sign % displays the remainder from a division operation. To determine if a number is even simply apply my_number % 2 == 0 where my_number is your number and if this result is True then your number is even, otherwise, it is odd. ...

How do you find the most common element in a list using Python without importing any special libraries? To find the most frequent elements in a list iterate through the list and store the frequency of each element into a dictionary with the key representing the element and the value representing the frequency. Finally, sort the dictionary by value in descending order to see the results with the highest frequency to the lowest. ...

How can you check the version of Python you are using in PyCharm? There are three ways to check the version of your Python interpreter being used in PyCharm: 1. check in the Settings section; 2. open a terminal prompt in your PyCharm project; 3. open the Python Console window in your Python project. Let’s look at each of these in a little more detail: How To Check Python Version Using PyCharm Settings To check the version of Python being used in your PyCharm environment, simply click on the PyCharm menu item in the top left of your screen, and then click on Preferences. ...

The slice operator enables you to capture a subset of data from an original list or string using the format [start:stop:step]. Some popular use cases where I have used the slice operator include: Extracting year and/or month and/or day of the month from a string Extracting the zip code at the tail end of an address string Masking bank account or credit card numbers Extracting area code from phone numbers Here is how the Python [:] operator can work when populating the values on either side of the colon: ...

There are times when you want to be able to print the contents of a variable along with a string to help provide some context around what has been output to the console. So how can you print both a string and a variable in Python? The three methods of being able to print a string and a variable together in Python is by using: string concatenation (using +), or using the .format() string method, or using f-strings. ...

How do you get a string to be all lowercase in Python? Thankfully there’s a built-in method that doesn’t require importing any external libraries to get a string to lower case, here’s how you do it. To get a string to all lowercase, use the built-in string method .lower(), which turns all characters in the string variable to lower case. Here is an example demonstrating the transformation of a string containing upper cases and converting them all to lower cases: ...

What is the syntax for writing a for loop on one line in Python? This syntax is known as a list comprehension and enables the user to write a for loop on one lin To write a for loop on one line in Python, known more commonly as the list comprehension, wrap the for loop in a list like so: [elem for elem in my_loop]. Here is an example demonstrating how this code works: ...