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python基础教程(自编精品)

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3.1.Ct?:

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Returntheidentityofanobject.

guaranteedtobeuniqueamongsimultaneouslyexistingobjects.

object’smemoryaddress.)

>>>

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>>>x=12>>>y=13>>>x=y>>>x13

>>>id(x)10416504>>>id(y)10416504>>>

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>>>x=12>>>id(x)10416516>>>x=15>>>id(x)10416480

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13ùCt??ê

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deffunction_name(parameters)μ(TAB)statement1(TAB)statement2(TAB)statement3(TAB)etc.

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#definefunction:adddefadd(x,y)μ

z=x+y

returnz

#definemainfunctiondefmain()μ

a=12

b=13

#function’add’calledc=add(a,b)printc#programmeentrymain()print’End!’

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deff1():

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3.1.Ct?:

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x=12printxdeff2():

y=13printydeff3():

printxprintydefmain():

f1()

f2()ó()main()

print’End!’

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>>>1213

Traceback(mostrecentcalllast):

main()

File\:/Python27/t2.py\line14,inFile\:/Python27/t2.py\line13,inmainf3()File\:/Python27/t2.py\line8,inf3printx

NameError:globalname’x’isnotdefined>>>

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13ùCt??ê

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defprintLocalx():

x=12

print’f1localx=’,printx

defprintLocaly():

y=13

print’f2localy=’,printy

defreadGlobal():

print’f3readglobalx=’,printx

print’f3readglobaly=’,printy

defmodifyGlobal():

globalx

print’f4writex=-1’x=-1defmain():

printLocalx()printLocaly()readGlobal()x=200y=100main()printxprint’End!’

modifyGlobal()

print’aftermodifiedglobalx=’,

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f1localx=12

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f2localy=13

f3readglobalx=f3readglobaly=

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f4writex=-1

afterf4modifiedglobalx=End!

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#definefun:multidefmulti(x,y)μ

z=x*y

returnz

#definemainfunctiondefmain()μ

a=12

b=13

#function’add’calledc=multi(a,b)printc#programmeentrymain()print’End!’

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