1. 使用縮進方式做為程式塊開始結束的標示，程式換行在行末尾加 "\"

2. 元祖(Tuple)數(shù)據(jù)類型，和List的不同是Tuple不能修改，優(yōu)點是執(zhí)行速度比List快，因為不能修改也就比較安全，團隊開發(fā)某些情況會用到。

3. Dict字典類型，若鍵有重複時，後面的建值會覆蓋掉前面的。

dict = {"banana": 20, "apple": 30, "orange": 40, "banana": 30} print(dict["banana"]) #30

? ?字典類型的排列順序是隨機的，與設定的順序不一定相同，所以在讀取時就不能使用index。

dict = {"banana":20, "apple": 30} result = dict.items() # 取得以[鍵:值]為組合的Array# [("banana":20), ("apple":30)] result = dict.setdefault("apple", 50) # 30 result = dict.setdefault("orange", 80) # create new fruits = ["apple", "mango", "orange"] #list numbers = (1, 2, 3) #tuple alphabets = {'a':'apple', 'b':'ball', 'c':'cat'} #dictionary vowels = {'a', 'e', 'i' , 'o', 'u'} #set

4. python3 內建了SQLite, 非常方便儲存數(shù)據(jù)，不需要再額外設定database環(huán)境

5. pyhon class 的 structure function.

class Person:def __init__(self, name, age):self.name = nameself.age = agedef myfunc(self):print("Hello my name is " + self.name)p1 = Person("John", 36) p1.myfunc()# the function called __init__(), which is always executed when the class is being initiated.# Use the __init__() function to assign values to object properties, or other operations that are necessary to do when the object is being created# The self parameter is a reference to the current instance of the class, and is used to access variables that belongs to the class.# It does not have to be named self , you can call it whatever you like, but it has to be the first parameter of any function in the class

?6. string join

sentence = ['this','is','a','sentence'] '-'.join(sentence) # this-is-a-sentence

7. function as function argument

def Calculate(func, *args):print(func(*args))def Add(arg1, arg2):return arg1 + arg2def Sub(arg1, arg2):return arg1 - arg2Calculate(Add, 1, 3) # 4 Calculate(Sub, 1, 3) # -1

另外還有一種 keyword argument的用法，Calulate(func, **keywordArgs)

?

轉載于:https://www.cnblogs.com/sipher/p/11437791.html

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