L 18: FOR LOOP IN PYTHON | PYTHON TUTORIALS FOR BEGINNERS | LOOPS IN PYTHON | ITERATIVE STATEMENTS
The for loop in Python is used to iterate over a sequence (list, tuple, string) or other iterable objects. Iterating over a sequence is called traversal.
Syntax:
for val in sequence:
loop body
Here, val is the variable that takes the value of the item inside the sequence on each iteration.
Loop continues until we reach the last item in the sequence. The body of for loop is separated from the rest of the code using indentation.
range() function:
We can generate a sequence of numbers using range() function. range(10) will generate numbers from 0 to 9 (10 numbers).
We can also define the start, stop and step size as range(start, stop,step_size). step_size defaults to 1 if not provided.
The range object is "lazy" in a sense because it doesn't generate every number that it "contains" when we create it. However, it is not an iterator since it supports in, len and _getitem_ operations.
This function does not store all the values in memory; it would be inefficient. So it remembers the start, stop, step size and generates the next number on the go.
To force this function to output all the items, we can use the function list().
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00:00 - Introduction
00:20 - For loop
00:40 - Syntax of For loop
01:45 - Example
03:32 - Range
05:50 - Example on Range
07:23 - Implementation in Jupyter Notebook
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