Knowing that you can use an increment (or decrement) on the values with this technique allows for many means to get a list prepopulated. This technique is important in several elements, however, if the list in the enumerate function is not populated with some value the technique will NOT work at all, as evidenced by the following example: > my_list = * 3)] Here are some ideas to get you started: > my_list = * 3)] You can use the above techniques with list comprehensions to create a list of values where the value of the prepopulated list increments (or decrements) according to however you wish. Is there a way to prepopulate a list in Python where each value is based on some mathematical relationship, for example, each value increments by 1? Creating List With Different Values For Each Element So as you can see there are no limits to prepopulating lists in Python and you can use a plethora of combinations when combining the multiplier and the concatenation operators to lists. The last example above combines two multiplied lists together to form a multi-element prepopulated list. The next two examples are equivalent – you can either concatenate lists together or have a prepopulated list with the exact values you need, before combining it with the prepopulated list multiplier. In the examples listed above, you can see the simple concatenation of a list that contains one element with a list containing 12 elements prepopulated with zeroes. Here are some examples: > my_list = + * 12
We can combine two lists using the list concatenation technique (using the + sign between two lists) and have the second list represent the prepopulated lists explored above. How About Different First Value & Then Same Values Everything Else?īut what if the first value in the initial list needs to be different, but all other values in the list are the same? Here’s how this looks: > my_list = * 10Īs you can see from the above example, I now have a list with each element containing zero values, or empty strings, or with some other value such as a dictionary. For example, to have a list of ten items with each value in the list being zero, do the following: my_list = * 10 The easiest way to create a list prepopulated with values is by defining the list with the values and applying the multiplication operator for the number of elements you want your lists to start with. This works well when you want to start a list empty, but what if you want to be able to start with a list so that it is prepopulated with values? The most popular I use the most is by defining my list variables using the list square bracket notation, for example as my_list =. You can construct a list in a certain number of ways as detailed in the Python documentation.
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