Python 函式和模組

函式包含 函式名字、引數、函式體

#定義乙個簡單的echo函式，來模仿linux中的echo

>>> 
defecho
(mesage):
print(mesage)
>>> echo(1234)
1234
>>> echo("1232efsfds")
1232efsfds
>>> echo('324324fdf')
324324fdf
>>> 
defecho
(mesage):
print("echo> %s" % mesage)
>>> echo('324324fdf')
echo> 324324fdf
#多個引數的情況
>>> 
defecho
(mesage1,mesage2):
print("echo> %s %s" % (mesage1,mesage2))
>>> echo(33,44)
echo> 33
44#缺少引數將報錯
>>> echo(33)
traceback (most recent call last):
file "", line 1, in
echo(33)
typeerror: echo() missing 1 required positional argument: 'mesage2'
#return功能
>>> 
defadd
(a,b):
return  a + b
>>> add(1,2)
3>>> print(add(2,3))
5>>> >>> def
echo
(mesage):
print(mesage)

>>> c=3

>>> 
defadd
():    a=1
b=2return a+b+c
>>> add()
6>>> print(a)
traceback (most recent call last):
file "", line 1, in
print(a)
nameerror: name 'a'
isnot defined
>>> print(c)
3>>>

函式匯入了sys模組，用到讀取輸入功能。

>>> def age_joke():

print('please input you age?')
age=int(sys.stdin.readline())
if age > 10
and age < 18:
print('you age is %s ,you are young' % age)
elif age > 20
and age < 30:
print('you are still young!')
elif age > 30
and age < 40:
print('you are not young!!')
elif age > 50:
print('you are too old !!!')
else :
print('oh,others!')
>>> age_joke()
please input you age?
10oh,others!
>>> age_joke()
please input you age?
11you age is 11 ,you are young
>>> age_joke()
please input you age?
22you are still young!
>>> age_joke()
please input you age?
32you are not young!!
>>> age_joke()
please input you age?
99you are too old !!!
>>> age_joke()
please input you age?
dfdfss
traceback (most recent call last):
file "", line 1, in age_joke()
file "", line 3, in age_joke
age=int(sys.stdin.readline())
valueerror: invalid literal for
int() with base 10: 'dfdfss\n'
>>>

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