num += 1 等價於 num = num + 1
num -= 1 等價於 num = num - 1
num *= 2 等價於 num = num * 2
num /= 2 等價於 num = num / 2
num //= 2 等價於 num = num // 2
num %= 2 等價於 num = num % 2
num **= 2 等價於 num = num ** 2
##輸入3個數,比較數值大小並列印
#第一種
num1 = int(input(「num1:」))
num2 = int(input(「num2:」))
num3 = int(input(「num3:」))
max_num =0
if num1>num2:
max_num= num1
if max_num > num3:
print(「max num is」,max_num)
else:
print(「max num is」,num3)
else:
max_num = num2
if max_num > num3:
print(「max num is」,max_num)
else:
print(「max num is」,num3)
##第二種
num1=int(input(「num1:」))
num2=int(input(「num2:」))
num3=int(input(「num3:」))
a=num1-num2
b=num1-num3
c=num2-num3
if a>=0 and b>=0:
print(「the max number is」,「num1:」,num1)
elif a<=0 and c>=0:
print(「the max number is」,「num2:」,num2)
else :
print(「the max number is」,「num3:」,num3)
if a<=0 and b<=0:
print(「the min number is」,「num1:」,num1)
elif a>=0 and c<=0:
print(「the min number is」,「num2:」,num2)
else :
print(「the min number is」,「num3:」,num3)
##while迴圈 語句
格式:while 條件:
命令##while語句當條件為真時執行
『』'age=50
flag=true ####–錯誤—,真值賦值首字母必須大寫 flag=true
while flag=true: ####–錯誤—,while迴圈判斷條件是判斷真假,不用等式,應該為while flag:
user_age=int(input(「guess my age:」))
if user_age=age: ###—錯誤—判斷中==表示等於
print (「yes」)
flag=false ####–錯誤—,真值賦值首字母必須大寫 ,flag=false
elif user_ageprint(「pls try bigger.」)
else:
print(「pls try smaller.」)
print(「end」)』』』
####while語句 執行命令需要首行縮排,不能在寫字本上寫**!!!縮排符格式不一樣,報錯"invalid character indentifier"
num=1
while num<=10:
num+=1
if num==11: ##while中加入if判斷,if條件成立,continue 跳過後面的while迴圈語句.continue表示返回到while迴圈開始的地方.
continue
print(num)
##輸出結果2 3 4 5 6 7 8 9 10 沒有11
###while…:
else:
####表示如果while迴圈正常結束,則執行else後面的語句,continue不會破壞while迴圈.非正常結束為break或者報錯
print(「hello world.」,end=』』)
print(「hello world.」,end=』』)
print(「hello world.」,end=』』)
#####輸出3行變為1行 end=』』
##九九乘法表
a=1b=1
while a<=9:
c=a*b
print(a,『x』,b,』=』,c,end=』 『)
b+=1
if b==10:
print(』』)
a+=1
b=acontinue
1 x 1 = 1 1 x 2 = 2 1 x 3 = 3 1 x 4 = 4 1 x 5 = 5 1 x 6 = 6 1 x 7 = 7 1 x 8 = 8 1 x 9 = 9
2 x 2 = 4 2 x 3 = 6 2 x 4 = 8 2 x 5 = 10 2 x 6 = 12 2 x 7 = 14 2 x 8 = 16 2 x 9 = 18
3 x 3 = 9 3 x 4 = 12 3 x 5 = 15 3 x 6 = 18 3 x 7 = 21 3 x 8 = 24 3 x 9 = 27
4 x 4 = 16 4 x 5 = 20 4 x 6 = 24 4 x 7 = 28 4 x 8 = 32 4 x 9 = 36
5 x 5 = 25 5 x 6 = 30 5 x 7 = 35 5 x 8 = 40 5 x 9 = 45
6 x 6 = 36 6 x 7 = 42 6 x 8 = 48 6 x 9 = 54
7 x 7 = 49 7 x 8 = 56 7 x 9 = 63
8 x 8 = 64 8 x 9 = 72
9 x 9 = 81
###錯誤示範
a=1b=1
while a<=9:
c=a*b
print(a,『x』,b,』=』,c,end=』 『)
b+=1
if b==9:
print(』』)
a+=1
b=acontinue ########此程式在執行時,a=9以後,b不停累加,b>9,不會執行if巢狀,不執行a累加,則迴圈無限重複.
1 x 1 = 1 1 x 2 = 2 1 x 3 = 3 1 x 4 = 4 1 x 5 = 5 1 x 6 = 6 1 x 7 = 7 1 x 8 = 8
2 x 2 = 4 2 x 3 = 6 2 x 4 = 8 2 x 5 = 10 2 x 6 = 12 2 x 7 = 14 2 x 8 = 16
3 x 3 = 9 3 x 4 = 12 3 x 5 = 15 3 x 6 = 18 3 x 7 = 21 3 x 8 = 24
4 x 4 = 16 4 x 5 = 20 4 x 6 = 24 4 x 7 = 28 4 x 8 = 32
5 x 5 = 25 5 x 6 = 30 5 x 7 = 35 5 x 8 = 40
6 x 6 = 36 6 x 7 = 42 6 x 8 = 48
7 x 7 = 49 7 x 8 = 56
8 x 8 = 64
9 x 9 = 81 9 x 10 = 90 9 x 11 = 99 9 x 12 = 108 9 x 13 = 117 9 x 14 = 126 9 x 15 = 135 9 x 16 = 144 9 x 17 = 153 9 x 18 = 162 9 x 19 = 171 9 x 20 = 180 9 x 21 = 189 9 x 22 = 198 9 x 23 = 207 9 x 24 = 216 9 x 25 = 225 9 x 26 = 234 9 x 27 = 243 9 x 28 = 252 9 x 29 = 261 9 x 30 = 270 9 x 31 = 279 9 x 32traceback (most recent call last):
file 「d:/wpy64-3720/zz/0524-3.py」, line 6, in
print(a,『x』,b,』=』,c,end=』 ')
keyboardinterrupt
###金字塔形
a=1b=1
while b<=9:
c=ab
print(a,』』,b,』=』,c,end=』\t』)
a+=1
while a>b:
print()
b+=1
a=1
Prolog第三天作業
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第三天python作業
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