[原创] Learning in Python：Chapter 5 Numeric Types

 1.  Built-in Numeric Tools

• Expression operators: +, -, *, /, >>, **, &, etc.
• Built-in mathematical functions: pow, abs, round, int, hex, bin, etc.
• Utility Modules: random, math, etc.

2.  Expression Operaters

 

• Ternary selection:  x if y else z
• Slicing:  x[i:j:k]

3.  Other build-in Numeric Tools

• import math
• math.pi, math.e
• math.sin(), math.cos(), math.tan()
• math.sqrt()
• math.floor(), math.trunc()
• import random
• random.random()
• random.randint(1, 10)
• random.choice()
• pow(), abs(), sum(), min(), max(), round()
• '%.1f' % 2.567, '{0:.2f}'.format(2.567)

4.  Other Numeric Types

• Decimal
• Fraction
• Sets
• Unordered, immutable
• x = set('abcde')
• member: 'e' in x
• difference: x - y
• union: x | y
• intersection: x & y
• symmetric difference: x ^ y