1.for語句:
腳本實例:
#!/usr/bin/python
for i in range(1,15):
print i
else:
print 'The loop is done !'
2.while/if語句:
腳本實例:
#!/usr/bin/env python
#FileName:while1.py
running = True
a = 20
b = int(raw_input('Enter A number b: '))
while running:
if a == b:
print ' good,Your number is Ture ! !'
running = False #狀態爲False則終止循環
else:
print 'Bad,Pleas Try Again!'
print 'Done'
3.break語句:
腳本實例:
#!/usr/bin/env python
#FileName:while1.py
running = True
a = 20
b = int(raw_input('Enter A number b: '))
while running:
if a == b:
print ' good,Your number is Ture ! !'
break #終止循環
else:
print 'Bad,Pleas Try Again!'
print 'Done'
4.continue語句:
腳本實例:
#!/usr/bin/python
#FileName:continue.py
while True:
A = int(raw_input('Enter A Number:'))
if A == 23:
print "The number is %s !" % A
break
if A != 23:
print "please continue enter number."
continue #符合該條件則繼續循環
print "Done"
5.try/except語句:
當我們運行程序時,有些因爲用戶輸入錯誤而無法避免的會造成程序錯誤或崩潰,比如5/0,輸入這個運算會造成因程序錯誤使程序崩潰或停止運行,若要避免這個錯誤而使得程序能夠繼續順利運行,try/except就有大作用啦。
try/except分爲兩個模塊,程序讀取時,會先嚐試try模塊中的語句,如果有錯誤會繼續運行except模塊中的語句,語句示例:
a=5
b=0
try:
c=a/b
print c
except:
print "please check your number!"
當try模塊運行時,因爲b=0,a/b錯誤的,所以會繼續運行except模塊的內容,該段語句的結果就是:
please check your number!