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這篇文章主要介紹了Python語言如何快速上手,具有一定借鑒價值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
如果要在python中寫中文,則要在xx.py的最前面聲明
#coding:utf-8
一、基礎語法:變量,字符串,函數,邏輯判斷,循環
varline = 2 ; print(varline); #打印字符串 print("hello Python"); print("你好,Python"); #整型和字符串的轉化 num1 = 100 ; num2 = "100"; num3 = num1 + int(num2); print(num3); #字符串操作 str1 = "hello world" ; str2 = str1 * 3 ; string_count = len(str1); print(string_count); print(str2); #字符串索引等價 print(str1[0]); print(str1[-11]) #===>h print(str1[1]); print(str1[-10]) #===>e print(str1[2]); print(str1[-9]) #===>l #可以將字符串進行分割 print(str1[0:5]);print(str1[6:11]); #===> hello world print(str1[-4:]); #函數的定義和使用 def Print(): print("hello world"); return "sss" ; sss = Print(); print(sss); def add(arg1 , arg2): return arg1 + arg2 ; print(add(1,2)); def getTempatuare(temp): return temp *9/5 + 32 ; print(str(getTempatuare(35)) + "'F"); #克轉千克算法 def print_kg(g): return float(g / 1000) ; print(str(print_kg(1)) + "kg"); #求直角三角形斜邊的長度 def Line_print(arg1,arg2): return ((arg1*arg1 + arg2 * arg2))**0.5 print("The right triangle third side's length is " + str(Line_print(3,4))); #str_rp = str1.replace(str1[:3],'*'*9); #print(str_rp) str11 = "{} a word she can get what she {} for." str12 = "{preposition} a word she can get what she {verb} for" str13 = "{0} a word she can get what she {1} for." str111 = str11.format('With','came'); str121 = str12.format(preposition = 'With',verb = 'came') str131 = str13.format('With','came') print(str111) print(str121) print(str131) #單獨創建 file1 = open('F:\\'+'hello.txt','w') file1.write("Hello world"); file1.close() #使用函數創建 def text_create(name, msg): desktop_path = 'F:\\' full_path = desktop_path + name + '.txt' file = open(full_path,'w') file.write(msg) file.close() print('Done') text_create('Yang','hello world') # ???? #變量的比較 teststr1 = "Hello" teststr2 = "World" teststr3 = "Hello" print(teststr1 in teststr2) print(teststr1 is teststr3) print(bool(teststr1)) print(bool('')) print(not teststr1) print(teststr1 < teststr3 and teststr2 > teststr1) print(teststr1 > teststr2 or teststr3 < teststr1) #python邏輯判斷學習 a = 1 b = 3 if a < b : a = 3 b = 2 else: a = 2 b = 3 print(a,b); if a < b: a = 3 b = 2 elif a > b: a = 2 b = 3 else: a = 100 b = 200 print(a,b) for i in 1,2,3,4,5,6: print(i) for string_str in "hello","world","world": print(string_str) for str1111 in "Hello": print(str1111)
二、Python數據結構:列表,元組,字典,集合
#python列表===> #特點:可以裝python的所有類型,包括元組,列表,字典等 city = ['廣東','云南','廣西','江西','HongKong','Shenzhen',123456] for i in 0,1,2,3,4,5,6: print(city[i]) city.insert(1,'北京') #列表的插入 for i in 0,1,2,3,4,5,6: print(city[i]) city.remove('HongKong') #列表的刪除 for i in 0,1,2,3,4,5,6: print(city[i]) del city[0] #使用del方法刪除列表中的元素 for i in 0,1,2,3,4,5: print(city[i]) #python元組 ===> #特點:不可修改,可被查看以及索引 num = ('1','2','3','4','5') for i in 0,1,2,3,4: print(num[i]) #python字典 ===> #特點:鍵值成對存在,鍵不可重復,值可重復,鍵不可改,值可以變,可以為任何對象 Dog = {'name':'sundy','age':18} Dog.update({'tel':119}) #往字典中添加鍵值對 print(Dog) del Dog['name'] #往字典中刪除鍵值對 print(Dog) #集合 num_set = {1,2,3,4,1,5} num_set.add(6) #往集合里添加元素 print(num_set) num_set.discard(3) #從集合里刪除元素 print(num_set)
三、Python語言面對對象:類的定義、使用以及類的繼承
#coding:utf-8 #定義一個類 class Anmial: var = 100 Dog = ['runing','eat','sleep'] #Dog是這個類的屬性 def function(self): #類里的方法 if Anmial.var == 10: print(Anmial.var) else: print(self+str(Anmial.Dog)) return Anmial.var #實例化類 Dog1 = Anmial() print(Anmial.Dog) #遍歷類中的成員 for i in Anmial.Dog: print(i) #創建實例屬性===>類似創建一個與Dog一樣的屬性 Anmial.log = '會飛','Hello','Monkey' print(Anmial.log) Anmial.function("屬性:") class CocaCola(): formula = ['caffeine','suger','water','soda'] def __init__(self,local_name): #===>self相當于可以用來訪問類中的成員或者創建屬性 self.logo_local = '橙汁' if local_name == '可樂': print(local_name) elif local_name == '橙汁': print(local_name) else: print('西瓜汁') def drink(self): #===>調用該方法的時候等效于 coke = CocaCola.drink(coke) print('Energy!') coke = CocaCola('可樂') coke1 = CocaCola('橙汁') coke2 = CocaCola('梨汁') #類的繼承===>xuebi相當于CocaCoal的子類,CocaCoal相當于父類 class xuebi(CocaCola): formula = ['白色','黃色','綠色'] xuebi = xuebi(CocaCola) #將CocaCola放在括號中,表面xuebi集成于CocalCola print(xuebi.formula) xuebi.drink() #這樣子類就可以調用父類的方法,繼續延用了
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