Range in Python (2)

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*Memo:

• My post explains a range (1).
• My post explains a range (3).

A range can be used with len() to get the length as shown below:

v = range(5)

print(*v)
# 0 1 2 3 4

print(len(v))
# 5

A non-empty range and empty range are:

• True and False, checking them with bool() respectively.
• False and True, inverting their truth values with not keyword respectively.

# Non-empty range
print(bool(range(1)))
# True

# Empty range
print(bool(range(0)))
# False

# Non-empty range
print(not range(1))
# False

# Empty range
print(not range(0))
# True

A range can be checked if a specific number is and isn't in the range with in keyword and with not and in keyword respectively as shown below:

v = range(3)

print(*v)
# 0 1 2

print(0 in v)
print(1 in v)
print(2 in v)
# True

print(3 in v)
print(range(3) in v)
# False

v = range(3)

print(*v)
# 0 1 2

print(0 not in v)
print(1 not in v)
print(2 not in v)
# False

print(3 not in v)
print(range(3) not in v)
# True

A range can be checked if the range is and isn't referred to by two variables with is keyword and with is and not keyword respectively as shown below:

v1 = range(3)
v2 = range(3)
v3 = v1

print(v1 is v2) # False
print(v1 is v3) # True

print(v1 is not v2) # True
print(v1 is not v3) # False

A range and other range can be checked if all the integers in them are and aren't the same with == and != respectively as shown below:

v = range(3)

print(v == range(3))         # 0 1 2      # True
print(v == range(2, -1, -1)) # 2 1 0      # False
print(v == range(0, 5, 2))   # 0 2 4      # False
print(v == range(0, -5, -2)) # 0 -2 -4    # False
print(v == range(2))         # 0 1        # False
print(v == range(0, 5, 4))   # 0 4        # False
print(v == range(0, -5, -4)) # 0 -4       # False
print(v == range(4))         # 0 1 2 3    # False
print(v == range(0, 7, 2))   # 0 2 4 6    # False
print(v == range(0, -7, -2)) # 0 -2 -4 -6 # False
print(v == range(0))         # Nothing    # False

v = range(3)

print(v != range(3))         # 0 1 2      # False
print(v != range(2, -1, -1)) # 2 1 0      # True
print(v != range(0, 5, 2))   # 0 2 4      # True
print(v != range(0, -5, -2)) # 0 -2 -4    # True
print(v != range(2))         # 0 1        # True
print(v == range(0, 5, 4))   # 0 4        # True
print(v == range(0, -5, -4)) # 0 -4       # True
print(v != range(4))         # 0 1 2 3    # True
print(v != range(0, 7, 2))   # 0 2 4 6    # True
print(v != range(0, -7, -2)) # 0 -2 -4 -6 # True
print(v != range(0))         # Nothing    # True

A range and other range cannot be checked if:

• the range is greater than other range with >.
• the range is greater than or equal to other range with >=.
• the range is less than other range with <.
• the range is less than or equal to other range with <=.

v = range(3)

print(v > range(3))
# TypeError: '>' not supported between instances of 'range' and 'range'

print(v >= range(3))
# TypeError: '>=' not supported between instances of 'range' and 'range'

print(v < range(3))
# TypeError: '<' not supported between instances of 'range' and 'range'

print(v <= range(3))
# TypeError: '<=' not supported between instances of 'range' and 'range'

A range and other range cannot be checked if they have and don't have their common integers with bool() and & and with not keyword and & respectively as shown below:

v = range(3)

print(bool(v & range(1, 4, 2)))
print(not (v & range(1, 4, 2)))
# TypeError: unsupported operand type(s) for &: 'range' and 'range'

A range cannot be enlarged with * and a number as shown below:

v = range(5) * 3
# TypeError: unsupported operand type(s) for *: 'range' and 'int'

A range and other ranges cannot be concatenated with + as shown below:

v = range(3) + range(3, 5) + range(5, 9)
# TypeError: unsupported operand type(s) for +: 'range' and 'range'

A range and other range cannot return:

• all the integers in them with '|' (Union: A ∪ B).
• their common integers with '&' (Intersection: A ∩ B).
• the integers in the range which aren't in other range with '-' (Difference: A - B).
• the integers in either the range or other range but not both with '^' (Symmetric Difference: A Δ B).

v = range(0, 5, 4) | range(0, 5, 2)
# TypeError: unsupported operand type(s) for |: 'range' and 'range'

v = range(4) & range(0, 5, 2)
# TypeError: unsupported operand type(s) for &: 'range' and 'range'

v = range(4) - range(0, 5, 2)
# TypeError: unsupported operand type(s) for -: 'range' and 'range'

v = range(4) ^ range(0, 5, 2)
# TypeError: unsupported operand type(s) for ^: 'range' and 'range'