python判斷

            
              a = 2
b = 1
if a > b:
    print(a)
else:
    print(b)

多個if語句
a = 2
b = 1
if a > b:
    print(a)
elif a == b:
    print(b)
elif a < b:
    print(a)

三元表達式
print(a if a > b else b) #打印a如果a大于b的話，否則打印b
            
          

循環

            
              有2種方式，for x in list,tutle，另一種是while循環

打印1到100的整數和
sum = 0
for i in range(1, 101):
    sum += i
print(sum)

sum = 0
i = 0
while i < 101:
    sum += i
    i += 1
print(sum)

break和continue，break是跳出當前循環，而continue是跳過本次循環，開啟下一次循環
sum = 0
i = 0
while i < 101:
    if i % 2 == 0: #跳過偶數，求出奇數和
        i += 1
        continue
    else:
        sum += i
        i += 1

print(sum)

sum = 0
i = 0
while i < 101:
    if i % 2 == 0:
        i += 1
        break
    else:
        sum += i
        i += 1
print("i的值為:", i) #最后i的值是1
print(sum)