Merge pull request #432 from johntheholman/patch-1

Updated range.md with Explanation and Further Examples

Author: wilfredinni

docs/builtin/range.md

@@ -16,8 +16,37 @@ Python range() built-in function
   </base-disclaimer-content>
 </base-disclaimer>
 
+# Basics
+
+The `range` type is commonly used in `for` loops to loop a specific number of times. `range` takes in three parameters, `start`, `stop` and `step`. Each parameter must be intergers (either built-in int or any object that implements the __index__() special method).
+
+If there is only one parameter, it represents the `stop` parameter. If the `step` parameter is omitted at all, it will default to `1`. If the `start` parameter is omitted, it will default to `0`.
+
+Ranges do support negative indices, but these are interpreted as indexing from the end of the sequence determined by the positive indices.
+
+***The advantage of the range type over a regular list or tuple is that a range object will always take the same (small) amount of memory, no matter the size of the range it represents
+
+## Input Parameters:
+
+Ranges implement all of the common sequence operations except concatenation and repetition (due to the fact that range objects can only represent sequences that follow a strict pattern and repetition and concatenation will usually violate that pattern).
+
+`start`:
+- The value of the start parameter
+- If not supplied, parameter will default to 0
+- Parameter value is _inclusive_
+
+`stop`
+- The value of the stop parameter
+- The only parameter that is required
+- Parameter value is _exclusive_
+
+`step`
+- The value of the step parameter
+- If not supplied, parameter will default to 1
+
 ## Examples
 
+Range with only `stop` parameter specified
 ```python
 >>> for i in range(5):
 ...     print(i)
@@ -28,6 +57,62 @@ Python range() built-in function
 # 4
 ```
 
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+Range with both `start` and `stop` parameters
+```python
+>>> for i in range(1,8):
+...     print(i)
+# 1
+# 2
+# 3
+# 4
+# 5
+# 6
+# 7
+```
+
+Range with all parameters specified
+```python
+>>> for i in range(0,30,5):
+...     print(i)
+# 0
+# 5
+# 10
+# 15
+# 20
+# 25
+```
+
+Range with all parameters, where the `stop` parameter is not divisible by the `step` parameter
+```python
+>>> for i in range(0,10,3):
+...     print(i)
+# 0
+# 3
+# 6
+# 9
+```
+
+Range with all parameters, where the `stop` and `step` parameters are negative
+```python
+>>> for i in range(0,-6,-1):
+...     print(i)
+# 0
+# -1
+# -2
+# -3
+# -4
+# -5
+```
+
+Two examples where the `stop` parameter is set to 0
+```python
+>>> for i in range(0):
+...     print(i)
+# 
+```
+
+```python
+>>> for i in range(1,0):
+...     print(i)
+# 
+```