Resetting the Recursion Limit

Python’s default recursion limit is 1000, meaning that Python won’t let a function call on itself more than 1000 times, which for most people is probably enough. The limit exists because allowing recursion to occur more than 1000 times doesn’t exactly make for lightweight code. If, however, you find yourself in need of a higher recursion […]

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Swapping Values in Python

Swapping the values of two variables in Python is actually a really simple task. Python makes it fairly easy to swap two values without a lot of bulky code or weird hacks. Check out how easy it is to swap two numbers with each other using the built in methods below: x, y = 33, […]

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How to Check for Anagrams In Python

In Python, there’s a fairly straightforward way to create a method that can be used to check strings against each other to see if the two strings are anagrams. Check out the function below to see the method in action — essentially it works by using the “==” comparison operator to see if the strings on […]

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Using Break and Continue Statements in Python

In Python, break statements are used to exit (or “break) a conditional loop that uses “for” or “while”. After the loop ends, the code will pick up from the line immediately following the break statement. Here’s an example: even_nums = (2, 4, 6) num_sum = 0 count = 0 for x in even_nums: num_sum = […]

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Quick Tip: Using Sets in Python

In Python, sets are lists that don’t contain any duplicate entries. Using the set type is a quick and easy way to make sure that a list doesn’t contain any duplicates. Here’s an example of how you would use it to check a list for duplicates: a = set([“Pizza”, “Ice Cream”, “Donuts”, “Pizza”]) print a […]

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Time a Python Function

In one of the previous articles (Measure Time in Python – time.time() vs time.clock()), we learned how to use the module timeit to benchmark a program. Since the program we timed in that article includes only raw statements instead of functions, we’re going to explore how to actually time a function in Python. Time a […]

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Hashing Files with Python

Remember that a hash is a function that takes a variable length sequence of bytes and converts it to a fixed length sequence. Calculating a hash for a file is always useful when you need to check if two files are identical, or to make sure that the contents of a file were not changed, […]

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Hashing Strings with Python

A hash function is a function that takes input of a variable length sequence of bytes and converts it to a fixed length sequence. It is a one way function. This means if f is the hashing function, calculating f(x) is pretty fast and simple, but trying to obtain x again will take years. The value returned […]

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How to Recursively Copy a Folder (Directory) in Python

Ever tried to copy a directory/folder in Python? Ever failed? No matter. Try again! If you haven’t already read it, look at the article How to Copy a File in Python with shutil for an explanation of how to copy files with shutil. Recursively Copying a Directory/Folder of Files in Python In the article that […]

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How to Rename (Move) a File in Python

Renaming (in Python it’s known as moving) a file in Python is really simple, and can be done in very few lines thanks to a handy module called shutil. shutil has a function called move that does precisely what the function name implies. It moves files or directories from one location to another. Here’s a […]

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