Python range() Method - GeeksforGeeks

05 Aug, 2021
There are many iterables in Python like list, tuple etc. range() gives another way to initialize a sequence of numbers using some conditions.range() is commonly used in for looping hence, knowledge of same is key aspect when dealing with any kind of Python code. 
Syntax : range(start, stop, step)Parameters : start : Element from which sequence constructed has to start. (default:0) stop : Element number at which numbers in sequence have to end (exclusive). step : Can be +ve or -ve number, denoting the elements need to be skipped during filling of list. (default:1)Returns : The list using the formula : list[n] = start + step*n (for both positive and negative step) where, n >=0 and list[n] = 0 and list[n] > stop (for negative step)Returns ValueError if step is 0. Value constraint is checked in case of step, failing to meet returns empty sequence, else returns sequence according to formula.  
Code #1 : Demonstrating range() without step parameter  
Python3
# Python3 code to demonstrate the# working of range() without step # using range()lis1 = list(range(6))lis2 = list(range(3, 6))lis3 = list(range(-6, 2)) # initializing list using range, 1 parameter# only stop parameterprint("List generated using 1 parameter : " + str(lis1)) # initializing list using range, 2 parameters# only step and stop parametersprint("List generated using 2 parameters : " + str(lis2)) # initializing list using range, 2 parameter# only step and stop parametersprint("List generated using 2 parameters with negatives : " + str(lis3))
Output:  
List generated using 1 parameter : [0, 1, 2, 3, 4, 5]
List generated using 2 parameters : [3, 4, 5]
List generated using 2 parameters with negatives : [-6, -5, -4, -3, -2, -1, 0, 1]
 Code #2 : Demonstrating range() using step  
Python3
# Python 3 code to demonstrate the# working of range() with step # initializing list using range# using stepprint("List generated using step : " +    str(list(range(3, 10, 2)))) # initializing list using range# using negative stepprint("List generated using negative step : " +                  str(list(range(10, -5, -3)))) # initializing list using range# using negative step,# value constraints fail caseprint("List generated using step, value constraints fail : " +                                 str(list(range(10, -5, 3)))) # initializing list using range# using 0 step# errorprint("List generated using 0 step : " +              str(list(range(3, 7, 0))))
Output:  
List generated using step : [3, 5, 7, 9]
List generated using negative step : [10, 7, 4, 1, -2]
List generated using step, value constraints fail : []
Exception: 
Traceback (most recent call last):
  File "/home/bdae725dff7b38d3681eee38f6a6d434.py", line 23, in 
    print("List generated using 0 step : " + str(list(range(3, 7, 0))))
ValueError: range() arg 3 must not be zero
 
saurabh1990aror
Python-Built-in-functions
python-list
python-tuple
Python
python-list
Writing code in comment?
Please use ide.geeksforgeeks.org,
generate link and share the link here.
How to Install PIP on Windows ?
Check if element exists in list in Python
How To Convert Python Dictionary To JSON?
How to drop one or multiple columns in Pandas Dataframe
Python Classes and Objects
Python | os.path.join() method
Python | Get unique values from a list
Create a directory in Python
Defaultdict in Python
Python | Pandas dataframe.groupby()