FlowControl

if流程控制

• 如果條件是True,就執行縮排內的程式區塊
• 使用4個空白鍵進行縮排

grade = 80
if(grade >=90):
    print('Excellent')
elif(grade >=60):
    print('Pass')
else:
    print('Fail')

While迴圈

• While只要是條件為真的條件,繼續執行
• break可以退出迴圈
• continue可以不理會接下去的程式,直接回到迴圈第一行

answer = 3
guess = 0
while guess != answer:
    guess = int(input('Please make a guess between 1~6:'))
    if guess > answer:
        print('Hint: bigger than that')
    elif guess < answer:
        print('Hint: smaller than that')
    else
        print('Bingo!')
        break               //退出迴圈

For迴圈

• for迴圈是用來迭帶序列化的資料(e.g. list, tuple, dictionary)

fruits = ['apple','guava','strawberry'];
for f in fruits:
    print('fruit: {f}')

for i in range(1,3):
    print(i)

for i in range(len(fruits)):
    print(fruits[i])

for index,i in enumerate(fruits):
    print(index, i)             

mytuple = (10,20,15)
for in in mytuple:
    print(i, end=' ')           //會拿到10 20 15

mydict = {'peter':50, 'mary':80, 'judy':20}
for i in mydict:
    print(i)                    //會拿到名字
for i in mydict.values():
    print(i)                    //會拿到數值