Teaching Kids Programming: Videos on Data Structures and Algorithms
The enumerate is a basic Python function (a generator) that is commonly used in a for loop to simplify your code and express it in a Pythonic manner. See below example:
1 2 3 | s = "Hello!" for i, v in enumerate(list(s)): print(i, v) |
s = "Hello!"
for i, v in enumerate(list(s)):
print(i, v)And you will get:
0 H 1 e 2 l 3 l 4 o 5 !
It is equivalent to the following, but nicer:
1 2 3 | s = "Hello!" for i in range(len(s)): print(i, s[i]) |
s = "Hello!"
for i in range(len(s)):
print(i, s[i])Implement the enumerate generator in Python
To implement this, it is actually quite easy, we just have to yield a tuple with index, and value in a for loop, see below:
1 2 3 | def my_enumerate(a): for i in range(len(a)): yield (i, a[i]) |
def my_enumerate(a):
for i in range(len(a)):
yield (i, a[i])And you can use it virtually the same way:
1 2 | for i, v in my_enumerate(list(s)): print(i, v) |
for i, v in my_enumerate(list(s)):
print(i, v)Prints the following:
0 H 1 e 2 l 3 l 4 o 5 !
I hope now you have a taste on how the “yield”, and generator, and also the enumerate function in Python works!
–EOF (The Ultimate Computing & Technology Blog) —
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