For issue freeCodeCamp#819

For issue 819

For issue 819

For issue 819

For issue 819

Python-Function-Range.md

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+# Python range(start, stop)
+
+Rather than being a function, range is actually an immutable sequence type and is commonly used for looping a specific number of times in for loops.
+`range(start, stop[, step])` is used in Python 3 to generate a sequence of type range from `start` till `stop` with increment of size `step`.
+
+## Arguments
+
+This function takes one argument, `start` or two arguments `start` and `stop` or three arguments `start`, `stop` and `step`.
+
+
+The value of the `start` parameter (or 0 if not provided)
+
+The value of the `stop` parameter (compulsory argument)
+
+The value of the `step` parameter (or 1 if not provided). It cannot be 0.
+
+All three must be of integer type.
+
+
+## Return
+
+If only `stop` is provided, it generates sequence of type range from `0` till `stop`.
+
+If both `start` and `stop` are provided, it generates sequence of type range from `start` till `stop`.
+
+If all three `start`, `stop` and `step` are provided, it generates sequence of type range from `start` till `stop` with increment of size `step`.
+
+
+
+## Example
+
+```python
+range(4)    # returns range(0, 4)
+range(1,8)  # returns range(1, 8)
+range(10,30,5)  # returns range(10, 30, 5)
+```
+:rocket: [Run Code](https://repl.it/CTIY/3)
+
+[Official Documentation](https://docs.python.org/3/library/functions.html#func-range)