some built in methods:
List:
append(),
pop(),
insert()

documentation of functions:

def name_of_function():
    '''
    DOCSTRING: Information about the function
    INPUT: 
    OUTPUT: hello
    
    '''
    print("Hello")

default parameter:

def say_hello(name='NAME'):
    print('hello ' + name)

def myfunc(*args):
  print(args)

args是以tuple的形式

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**kwargs传进去是keyword argument的形式，会是dictionary的类型

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python string 没有append方法，用s += 'ABC'来做

reverse a string:

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检查某个str有没有一个subsequence的方法：

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