Python enumerate() is a function used to associate a digital index with each element of a sequence. It is useful for numbering chains and enumerations.
What is the Python function enumerate() ?
Python function enumerate() is used for make an enumeration from an entrance. This function attributes a digital index to each element of a sequence, such as a character string or a python. The enumeration is continuous and begins by default at « 0 ». This function is included by default in this programming language.
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Python syntax and parameters enumerate()
The Syntax of Python Enumerate () is as follows:
enumerate(iterable, start)python
She has two parameters:
iterable: This is an object or a sequence that can be executed in a loop. This parameter will then be placed before enumeration. It is compulsory.start: This parameter is optional. It allows you to determine from which numerical value the numbering must begin. Its default is « 0 ».
Example of enumeration with enumerate()
To illustrate the functioning of the function, we will choose a simple example with four different colors. We number them using the function enumerate() of Python. The corresponding code presents itself as follows:
couleurs = ['bleu', 'rouge', 'jaune', 'orange']
séquence = enumerate(couleurs)
print(list(séquence))python
It gives us this outing:
[(0, 'bleu'), (1, 'rouge'), (2, 'jaune'), (3, 'orange')]python
Python enumerate() with a starting index
As we have not specified a starting index, the list begins at « 0 ». To change this, we add to Python enumerate() THE « Start » parameter with the value « 1 ». The previous code should only be slightly changed:
couleurs = ['bleu', 'rouge', 'jaune', 'orange']
séquence = enumerate(couleurs, 1)
print(list(séquence))python
Our outing is immediately improved:
[(1, 'bleu'), (2, 'rouge'), (3, 'jaune'), (4, 'orange')]python
You can change the starting index as you wish: the enumeration can start at any other value.
The function enumerate() with a loop for
It is possible to combine a fork loop, with python enumerate()whether it is With or without starting index. For the first loop, we will not use the « Start » parameter. The counting therefore begins at « 0 ». For the second loop, we will add the parameter with the starting point « 5 ». The counting therefore starts from this point. With the indicator "\n"we ask the system to create a new line each time to make things a little clearer. Here is the code of this combination:
couleurs = ['bleu', 'rouge', 'jaune', 'orange']
for séquence in enumerate(couleurs):
print(séquence)
print("\n")
print("Ça reprend à partir de 5")
for séquence in enumerate(couleurs, 5):
print(séquence)
print("\n")python
Our outing now looks like this:
(0, 'bleu')
(1, 'rouge')
(2, 'jaune')
(3, 'orange')
Ça reprend à partir de 5
(5, 'bleu')
(6, 'rouge')
(7, 'jaune')
(8, 'orange')python
List a chain with python enumerate()
If you want to list a character string, Python enumerate() is also a good choice. The chain is broken down and numbered. Here is what the corresponding code looks like:
chaine = "exemple"
for x in enumerate(chaine, 1):
print(x)python
The exit will be as follows:
(1, 'e')
(2, 'x')
(3, 'e')
(4, 'm')
(5, 'p')
(6, 'l')
(7, 'e')python
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