Numbers

  • int

  • float

  • complex

The basics about numbers

Example:

 1 #!/usr/bin/env python3
 2
 3 def main():
 4     q = -1
 5     x = 1
 6     y = 3.14
 7     z = 1j
 8     print(type(q))
 9     print(type(x))
10     print(type(y))
11     print(type(z))
12
13
14 if __name__ == "__main__":
15     main()

Output:

1 <class 'int'>
2 <class 'int'>
3 <class 'float'>
4 <class 'complex'>

Type conversion

Complex numbers cannot be converted into another number type

Example:

 1 #!/usr/bin/env python3
 2
 3 def main():
 4     x = 1
 5     y = 3.14
 6     z = 1j
 7
 8     a = float(x)
 9     b = float(y)
10
11     print(a)
12     print(b)
13
14     print(type(a))
15     print(type(b))
16
17
18 if __name__ == "__main__":
19     main()

Generate a random number

Example:

 1 #!/usr/bin/env python3
 2
 3 import random
 4
 5 def main():
 6     print(random.randrange(1, 10))
 7
 8
 9 if __name__ == "__main__":
10     main()

randint and seed

Absolute value

Example:

 1 #!/usr/bin/env python3
 2
 3 import random
 4
 5 def main():
 6     print(abs(-1))
 7
 8
 9 if __name__ == "__main__":
10     main()

Output:

1 1

Using the math module

A [math](https://docs.python.org/3/library/math.html) modules ships with Python for advanced calculations.

Example:

 1 #!/usr/bin/env python3
 2
 3 import math
 4
 5 def main():
 6     # print Pi
 7     print(math.pi)
 8     # Determine the smallest integer greater than or equal
 9     print(math.ceil(8.3))
10     # Determine the largest integer smaller than or equal
11     print(math.floor(8.3))
12     # Print the square root
13     print(math.sqrt(9))
14
15
16 if __name__ == "__main__":
17     main()

Output:

1 3.141592653589793
2 9
3 8
4 3.0

Converting between decimal, binary, octal, and hexadecimal

Example:

 1 #!/usr/bin/env python3
 2
 3 import math
 4
 5 def main():
 6     value_dec = 128
 7     value_bin = 0b10000000
 8     value_oct = 0o200
 9     value_hex = 0x80
10
11     print("The value_decimal value of", value_dec, "is:")
12     print(bin(value_dec), "in binary.")
13     print(oct(value_dec), "in octal.")
14     print(hex(value_dec), "in hexadecimal.")
15
16     print("The binary value of", (value_bin), "is:")
17     print(int(value_bin), "in decimal.")
18     print(oct(value_bin), "in octal.")
19     print(hex(value_bin), "in hexadecimal.")
20
21     print("The octal value of", oct(value_oct), "is:")
22     print(int(value_oct), "in decimal.")
23     print(bin(value_oct), "in binary.")
24     print(hex(value_oct), "in hexadecimal.")
25
26     print("The hexvalue_decimal value of", hex(value_hex), "is:")
27     print(int(value_hex), "in decimal.")
28     print(bin(value_hex), "in binary.")
29     print(oct(value_hex), "in octal.")
30
31
32 if __name__ == "__main__":
33     main()

Output:

 1 The value_decimal value of 128 is:
 2 0b10000000 in binary.
 3 0o200 in octal.
 4 0x80 in hexadecimal.
 5 The binary value of 128 is:
 6 128 in decimal.
 7 0o200 in octal.
 8 0x80 in hexadecimal.
 9 The octal value of 0o200 is:
10 128 in decimal.
11 0b10000000 in binary.
12 0x80 in hexadecimal.
13 The hexvalue_decimal value of 0x80 is:
14 128 in decimal.
15 0b10000000 in binary.
16 0o200 in octal.