迴圈（looping），計數迴圈（counting loop），條件迴圈（conditional loop）。
1 計數迴圈，for迴圈
for looper in [1,2,3,4,5]:
print "hello"
再來試試看
for looper in [1,2,3,4,5]:
print looper
再來是乙個有意義點的程式，8的乘法表
for looper in [1,2,3,4,5]:
print looper, "times 8 =", looper * 8
執行結果如下
>>> ******************************== restart ******************************==
>>>
1 times 8 = 8
2 times 8 = 16
3 times 8 = 24
4 times 8 = 32
5 times 8 = 40
迴圈函式range()，
for looper in range (1,5):
print looper, "times 8 =", looper * 8
>>> ******************************== restart ******************************==
>>>
1 times 8 = 8
2 times 8 = 16
3 times 8 = 24
4 times 8 = 32
range()，提供乙個數字列表，從給的第乙個數開始，在給的的最後乙個數之前結束。必須要注意到這一點。
再來乙個例子，8的乘法表（從1到10）
for looper in range (1,11):
print looper, "times 8 =", looper * 8
for i in range (1,5):
print i, "times 8 =", i * 8
for i in range (5):
# 與寫作 for i in range (0, 5): 完全相同
print i, "times 8 =", i * 8
for i in range (1,10,2):
print i
for i in range (10, 1, -1):
print i
# 與孩子一起學程式設計08章
# 2023年8月27日14:03:52
# range()迴圈反向計數-2 8-10
import time
for i in range (10, 0, -1):
print i
time.sleep(1)
print "blast off!"
沒有數字的計數迴圈
for cool_guy in ["spongebob", "spoderman", "justin timberlake", "my dad"]:
print cool_guy, "is the coolest guy ever!"
>>>
spongebob is the coolest guy ever!
spoderman is the coolest guy ever!
justin timberlake is the coolest guy ever!
my dad is the coolest guy ever!
>>>
2 條件迴圈，while迴圈
如果能提前知道希望迴圈執行多少次，那麼for迴圈挺合適。不過，有時希望迴圈一直執行下去，直到發生某種情況時才結束，而且不知道發生這種情況之前會有多少次迭代。這就可以用while迴圈來實現。
print "type 3 to continue, anything else to quit."
someinput = raw_input()
while someinput == '3':
print "thank you for the 3. very kind of you."
print "type 3 to continue, anything else to quit."
someinput = raw_input()
print "that's not 3, so i'm quitting now."
>>>
type 3 to continue, anything else to quit.
3thank you for the 3. very kind of you.
type 3 to continue, anything else to quit.
3thank you for the 3. very kind of you.
type 3 to continue, anything else to quit.
3thank you for the 3. very kind of you.
type 3 to continue, anything else to quit.
5that's not 3, so i'm quitting now.
>>>
3 跳出迴圈——break和continue
用continue直接跳到迴圈的下一次迭代，或者用break完全終止迴圈。
先來看continue的用法
for i in range (1, 6):
print
print 'i =', i,
print 'hello, how',
if i == 3:
continue
print 'are you today?'
>>>
i = 1 hello, how are you today?
i = 2 hello, how are you today?
i = 3 hello, how
i = 4 hello, how are you today?
i = 5 hello, how are you today?
break的用法
for i in range (1, 6):
print
print 'i =', i,
print 'hello, how',
if i == 3:
break
print 'are you today?'
>>>
i = 1 hello, how are you today?
i = 2 hello, how are you today?
i = 3 hello, how
>>>
好了，python中的迴圈學習就到這兒，上一章的if，條件和測試，及這一章中計數迴圈和條件迴圈，差不多了吧，我都躍躍欲試了，呵呵。
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