To join a list of strings into a string in Python: For example, let’s join a list of words by a dash: Output: Perhaps the most common question is how to join strings into one string separated by space. To do this: Here is how it looks in code. Output: If you were looking for […]
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To save a plot with matplotlib: Create a plot. Give a name to the plot. Call the matplotlib.pyplot.savefig() and pass the name as an argument. Here is an example where the script saves a plot to the same folder: To conveniently test this piece of code yourself, here is the code: This is how easy
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To see where pip installs packages on your system, run the following command: And replace <package_name> with the actual name of the package. Example: NumPy Location For example, let’s see where NumPy is installed: Output: Here you can see that the location field says the package is installed at /usr/local/lib/python3.8/site-packages. The location obviously depends on
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In Python, the difference between the append() and extend() method is that: Here is a quick cheat sheet that describes the differences. extend() append() Adds multiple elements to a list. Adds the input as a single element to a list. Length increases by the number of elements added. Length increases by 1. Time complexity is
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In Python 3.7+ it’s possible to sort a dictionary. Before Python 3.7 dictionaries were unordered and thus you could not sort them. To sort a dictionary in Python: For example, let’s sort a dictionary by values in descending order and print out the sorted values: This gives a following output: This is a comprehensive guide
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To access the index in a for loop in Python, use the enumerate() function. For example: Output: This is a quick answer to your question. However, if you are unfamiliar with the syntax, or want to figure out alternative ways to access the index in a for loop, please stick around. In this guide you
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In Python, copying a list can be unintuitive for beginners. This is because you cannot use the assignment operator to take an independent copy of a list. This can be confusing especially for beginner Pythonistas. To create an independent copy of a list in Python, you need to use the copy module’s deepcopy() function like
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To remove an element from a NumPy array: For example: Output: This is the quick answer. However, there is a lot more when it comes to removing elements from a NumPy array. In this guide, you are going to learn how to: How Does numpy.delete() Work In NumPy, there is a built-in function numpy.delete() you
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A NumPy array does not have a built-in append method. Instead, to append elements to a NumPy array, use a separate numpy.append() function. For example: Output: Notice how numpy.append() creates a new copy of the original array. It does not directly append values to it. In this guide, you learn: How to Append to a
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To create an empty NumPy array: For instance, let’s create an empty array with no elements: Output: However, creating an array without elements rarely makes any sense. Instead, you should know and specify the shape of the final array in advance. For instance, let’s create an empty 2D array: Output (contains arbitrary values due to
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