2018-01-07 Python Branch statement

Mind Map of this article:

Program

• Order
  Follow the order
  For example: Wash your hands first, eat again, and then wash the dishes.
• Branch
  According to different circumstances, the condition satisfies the execution of the statement under certain conditions.
  For example: Wash hands first, if the rice did not do well, play games, if the meal is done, eat, if the rice has not done, called takeout.
• Cycle
  The condition is fulfilled on a recurring, non-satisfied execution or no longer performed.
  For example: Wash hands first, look at the meal is not good, no good, one will look at once, until the meal is ready, only to start eating. The cycle condition here is that the meal is not done well, the cycle to see the rice is good. Single BRANCH statement
• If statement
  If condition:
  code block
  Condition must be a bool type, this place has an implicit conversion bool (condition)
  If 1<2:
  Print (' 1 less than 2 ')

• code block
  Similar to the IF statement is followed by a statement block
  In If,for,def,class etc.

  Truth table

Object/Constant	value
“ ”	False
"String"	Really
0	False
>=1	Really
<=-1	Really
() Empty tuple	False
Empty list	False
Empty dictionary	False
None	False

False等价布尔值，相当于bool(value)    空集合        空字符串        空字典        空列表        空元组    None对象    0

Multi-Branch statements

• If...elif...else statements
• Examples of branching and nesting exercises

2018-01-07 Python Branch statement