python基础教程（自编精品）

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4.1L?a

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4.1.1?aL?a

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>>>x=12>>>y=13>>>z=2>>>su=x+y>>>sm=x-y>>>sc=x*y>>>sd=x/y>>>sq=x%y

m?oc.??udêe?eapj.www>>>sf=-x

>>>xz=x**z

>>>printsu,sm,sc,sd,sq,sf,xz25-1156012-12144

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4.1.2'XL?a

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>>>4==4True>>>4!=4False>>>4<5True>>>4>=3True

>>>\<\True

4.1.3ü6L?a

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>>>A=True>>>B=False>>>AandBFalse

>>>AorBTrue>>>notA

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>>>Aand(notB)True

4.2if?|?é

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>>>sex=’male’>>>ifsex==’male’:

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4.3.IFELSE?é

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print’Man!’#d?küg￡?…Man!

>>>ifsex==’female’:

print’Woman’#d?küg￡?…>>>

4.3ifelse?é

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statements

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sex=raw_input(\plzinputyoursex:\ifsex==’male’orsex==’m’:

print’Man!’

else:

m?oc.??udêe?eapj.wwwprint’Woman!’

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plzinputyoursex:femaleWoman

‰????S§?\\ê?¤1(??/)§0～60?<”NoPass!”§60～70?<”JustPass?”§

70～80?<”Good”§70～80?<”Wonderful!”§80～90?<”Excellent!”§90～100?<”Best!”§?^ifelsei@5??¤\

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#coding:utf-8

x=input(\plzinputmathrecord:\ifx>=60:

ifx>=70:

ifx>=80:

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ifx>=90:

print\Best!\else:

print\Excellent!\

else:

print\Good!\else:

print\Just?Pass\

else:

print\NoPass!\

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>>>=========RESTART=========plzinputmathrecord:27NoPass!

>>>=========RESTART=========plzinputmathrecord:67Just?Pass

>>>=========RESTART=========plzinputmathrecord:77Good!

plzinputmathrecord:80

>>>=========RESTART=========Excellent!

>>>=========RESTART=========plzinputmathrecord:98Best!>>>

4.4ifelifelse??|?é

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if:

statements_1elif:

statements_2elif:

statements_3...

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