--Originally published at Quirino´s Projects
When you want to get a set of the range from number ‘a’ to number ‘b’
range() Is the function you might want to use. To create it one argument is enough, we could simply do:
range(5)
This creates a set from 0 to 5
This argument is called ‘Stop’, indicates where to stop, since we have no ‘Start’ argument, python takes ‘0’ as the starting number
If we want to start from another number we need to pass two arguments to the function
range(6,22)
This creates a set from 6 to 22
Now that range is taking two parameters, the first one is ‘Start’ it defines where the range will start and the second will be ‘Stop’
The third argument the range function can take is ‘Step’ this indicates the step the range, for example
range(0,100,2)
Will create all the even numbers from 0 to 100
The range function can be treated like a list but its still a range object
The most common use i have found for ranges is to do something n times in an object with a for loop with the index of the object each iteration.
Example
If i wanted to work with the index of the string “Juan”
using
for i in string:
would return J u a n
Instead i could use
for i in range(len(juan))
This would return 0 1 2 3
