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              Python循環

              Python循環

              while
              #語法:
              while condition:
              block #當條件滿足即condition為True,進入循環體,執行block
              #舉例:
              flag=10
              while flag:
              print(flag)
              flag -= 1
              #如果flag=-10:
              flag=-10
              while flag:
              print(flag)
              flag += 1
              for
              for element in itratable:
              block #當迭代對象中有元素可以迭代,進入循環體,執行block
              range函數
              前包后不包range(10) 從0開始不包括末尾的10
              for i in range(10):
              print(i+1)
              #倒敘打印
              for i in range(10,0,-1):
              print(i)
              continue
              [中斷當前循環的當次執行,繼續下一次循環]
              #舉例:計算10以內的偶數
              #方法1
              for i in range(0,11,2):
              if i != 0:
              print(i)
              #方法2:
              for i in range(11):
              if i%2 == 0 and i != 0:
              print(i)
              break
              [終止bread所在整個循環]
              #測試break范圍:
              for i in range(2):
              for j in range(10):
              if j < 2:
              print(j)
              else:
              break
              print(“aaa”)
              0
              1
              aaa
              0
              1
              aaa `由此結果證明break范圍為所在循環`
              練習:
              #給定一個不超過5位的正整數,判斷其有幾位,依次打印出個位、十位、百位、千位、萬位的數字
              Input_Num=int(input(“Please input integer number:”))
              for i in range(len(Input_Num)): #取出數字長度決定循環次數
              n=Input_Num%10 #將最后一位取出
              Input_Num//=10 #將取出后的剩余數字賦值
              print(n) #打印最后一位
              y=int(input(“hehhe:”))#邏輯與上面for循環類似
              Num_len=4
              while Num_len != 0:
              n=y%10
              y//=10
              print(n)
              Num_len-=1
              循環else字句:
              如果循環正常的執行結束,就執行else字句,如果使用break終止,else字句不會執行
              #語法:
              while condition:
              block
              else:
              block
              for element in iteratable:
              blcok
              else:
              block
              help(函數名稱)[]help(range)],查看函數幫助
              練習
              • 打印一個邊長為n的正方形
              print(6*”*”)
              for i in range(4):
              print(“*” + 4*” ” + “*”)
              print(6*”*”)
              • 打印菱形
              n=3
              for i in range(1,8,2):
              print(n*” “,i*”*”)
              n-=1
              n=1
              for x in range(5,0,-2):
              print(n*” “,x*”*”)
              n+=1
              • 求100以內所有奇數的和
              n=0
              for i in range(1,100):
              if i%2 != 0:
              n+=i
              print(n)
              • 求1到5階乘之和
              a=1
              b=0
              for i in range(1,6):
              a *= i #將階乘結果賦予a
              b += a #將每個階乘的結果累加賦予b
              pirnt(b)
              • 給一個數,判斷它是否是素數(質數):一個大于1的自然數只能被1和它本身整除
              m=int(input(“please input >1 number:”))
              for i in range(2,m):
              if m%i == 0:
              print(“No”)
              break
              else:
              print(“Yes”)
              • 打印九九乘法表
              for i in range(1,10):#循環9列
              for j in range(1,10):#每行打印結果循環
              if j <= i:#判斷打印區間
              print(j,”*”,i,”=”,j*i, end = ” “)
              print(” “)
              • 打印100以內的斐波那契數列
              a=0
              b=1
              while True:
              x=a+b
              if x<100:
              print(x)
              else:
              break
              a=b
              b=x
              • 求斐波那契數列第101項
              a=0
              b=1
              c=0
              while True:
              x=a+b
              a=b
              b=x
              c+=1#計數器
              if c == 100:
              print(x)
              break
              • 求10萬內的所有素數
              import datetime
              starttime = datetime.datetime.now()
              for i in range(2,100000):
              for x in range(2,i):
              if i%x==0:
              break
              else:
              print(i)
              endtime = datetime.datetime.now()
              print (endtime – starttime,”.seconds”)

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