The structure statement of Python learning

A loop statement:

1.1 for X in Rang (n): #rang (n) generates a sequence of left closed right open intervals

1.2 While x condition N:

Two conditional statements:

An IF condition expression:

Elif expression:

Elif expression:

...

Else

Three Break Continu

Four: function:

4.1 Definition: def func (parameter list):

　　　　if not isinstance(x, (int, float)):#参数检查相当于断言


　　　　　　raise TypeError(‘bad operand type‘)

Return argument list # "when more than one return is actually returned a tuple (with the remaining parentheses), does not show return actually went back to none"

4.2 References: from filename.py import func_name

4.3 null function: Def NOP ():

Pass #占位语句, error-proof also for later expansion convenience.

4.4 Parameters of the function: Default parameter (x,y=2), variable parameter (equivalent to tuple, * tuple or list), keyword argument (dict class * *). The name keyword argument (*,x,y):* followed by the keyword argument.

4.5 Recursive function: Clear structure (recursive can be written as a looping structure), but to prevent stack overflow (to be optimized with tail recursion)

The structure statement of Python learning