Overview:
- The Python class range represents a sequence of numbers. Similar to a tuple, which is an immutable sequence a range is also immutable.
- An immutable sequence cannot be added or removed elements from it.
- Range is used in for loops to perform specific number of iterations based on an value, which is decremented or incremented by a number till a boundary value is reached.
- Range cannot produce the same number twice. The sequence should be increasing or decreasing all the times. The default value for the parameter step is 1 and it cannot be 0.
- Range does not allow any of its parameter to be a float. Hence it cannot be used to produce a continuous distribution. The numpy.arange() function can be used to produce an ndarray of floating point numbers.
Example - Increasing range:
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# Print an increasing sequence with default values for start and step parameters print("An increasing sequence produced by range class:"); stop = 5; for i in range(stop): # default values for start and step which is 1 print(i);
print("Odd number series produced by range class :"); start = 1; stop = 10; step = 2; for i in range(1, 10, 2): print(i); |
Output:
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An increasing sequence produced by range class: 0 1 2 3 4 Odd number series produced by range class: 1 3 5 7 9 |
Example - Decreasing range:
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# Create a sequence of numbers spanning from -10 to +10 using the range class start = 10; stop = -12; step = -2;
for j in range(start, stop, step): print(j); |
Output:
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10 8 6 4 2 0 -2 -4 -6 -8 -10 |