Python Help and variable type casting

First, help
Dir ()
Dir Function View Properties
Example:
A = [1, ' abc ', ' dh ', ' ft ', 678]
Print (dir (a))

Help ()
Example Help (sorted)
#显示
#sorted (...)
# sorted (iterable, Cmp=none, Key=none, Reverse=false)--New sorted list

#type ()

#ctrl加鼠标左键 to understand function usage

II. Coercion of variable types
Age = 20
Print (' My age was: ' + age)
#执行会报错, age is an integer, print this is a string type
Switch
Age = 20
Print (' My age is: ' + str ')

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Python Help and variable type casting