新手學python之新體驗
2024-10-21 17:32:49
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)數據類型,和List的不同是Tuple不能修改,優點是執行速度比List快,因為不能修改也就比較安全,團隊開發某些情況會用到。
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) #
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, 非常方便储存數據,不需要再額外設定database環境
5. pyhon class 的 structure function.
class Person:
def __init__(self, name, age):
self.name = name
self.age = age def 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 + arg2 def Sub(arg1, arg2):
return arg1 - arg2 Calculate(Add, 1, 3) #
Calculate(Sub, 1, 3) # -1
另外還有一種 keyword argument的用法,Calulate(func, **keywordArgs)
最新文章
- vagrant 1.8.6 安装过程及总结遇到的坑
- php面向对象编程(二)
- linux下常见的字符串处理
- 【PHP面向对象(OOP)编程入门教程】3.什么是面向对象编程呢?
- 精通AngularJS 读书笔记(1)
- Selenium2+python自动化15-select下拉框
- Python:print显示颜色
- 读取本地Json文件
- MVC系列之二 Model层细解
- dialog参数、方法以及事件
- 0128——手势Gesture
- NET基础课--代码安全
- JavaScript 运动框架 Step by step
- Runtime.exec使用错误导致延迟.md
- juery悬浮框
- java学习笔记06-条件语句
- SpringBoot系列: Web应用鉴权思路
- 固态硬盘的PCIE,SATA,M2,NVMe,AHCI分别都指什么?别再搞混了
- 微服务-注册与发现-zookeeper bydasn
- 利用STM32CubeMX来生成USB_HID_host工程