Study notes about how to return a function, how to get elements from list or dictionary.

Return

Only when I want to quit my functions, multiple returns is acceptable.

def get_class_average(students):
    results = []
    for each in students:
        result=get_average(each)
        results.append(result)
    return average(results)

Get elements from list

• list-name[Serial number] remember serial numbers start from 0

a = [1,2,3]
print a[2]

output: 3

• the tpye of list-name[1] is the element it self.

a = [1,"h",3]
print type(a[2])

output: <type 'int'>

• the type of list-name [1:4] is a list

a = [1,"h",3]
print type(a[2:3])

output: <type 'list'>

Get element from dictionary

• dictionary-name[key]

a = {"Jing":"girl", "Zhe":"boy"}
print a["Zhe"]

output: boy

links of Data Structures in the The Python Tutorial https://docs.python.org/3/tutorial/datastructures.html