Python enumerate() Function | Enumerate function Python смотреть онлайн

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Python Notes:
Enumerate in python
The enumerate() function adds a counter to an iterable and returns it (the enumerate object).

The enumerate() function is a built-in function that returns an enumerate object. This lets you get the index of an element while iterating over a list.

In other programming languages (C), you often use a for loop to get the index, where you use the length of the array and then get the index using that. That is not Pythonic, instead you should use enumerate().

In Python you can iterate over the list while getting the index and value immediately.

The basic syntax is is enumerate(sequence, start=0)

The enumerate() function takes two arguments:

iterable - a sequence, an iterator, or objects that support iteration
start (optional) - enumerate() starts counting from this number. If start is omitted, 0 is taken as start.


The output object includes a counter like so: (0, thing[0]), (1, thing[1]), (2, thing[2]),

As input it takes a sequence like a list, tuple or iterator. The start parameter is optional.
If the start parameter is set to one, counting will start from one instead of zero

Create a sequence and feed it to the enumerate function. This can be any type of sequence, in this example we use a list. Then we output the object.
Example:
employees = ["Mark", "Anthony", "Peter"]
e1 = enumerate(employees)
print(e1)
lst = list(e1)
print(lst)
print(type(lst[0]))

for i, f in enumerate(employees, start = 2):
print(f'{ i } - { f }')

t1 = [(0, 'Mark'), (1, 'Anthony'), (2, 'Peter')]

for i, f in enumerate(t1):
print(f'{i} - {f}')

employeeName = "Anthony"
for i, f in enumerate(employeeName, start = 1):
if i == 2:
print(f"Index={ i }")
print(f'{i} - {f}')

d1 = {'EmployeeName':"Jhon", "Email": "[email protected]"}
print(d1)
for k, v in d1.items():
print(f'Key:{k}, Value:{v}')

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