Python语言编程基础ppt.pdf

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1、语编础张释开编语码解释器释语执码编译标码执行编译语执区别•码缩进缩进选内录••数•对•关键•••语•继•••数••顺•组•••释赋过编语x=10printx单来x=“China”printx10China数内数数printtype('Hello')printtype(18)x="China"printtype(x)printtype(3.0)数链数组关键须线写别关键Name=‘PYTHON’name=‘python’printname,NamepythonPYTHON语须线写别nessage=“H

2、owareyou”时须赋n=18则为pi=3.1415926printabcNameError:name’abc’isnotdefined组认为12345语该语pi=3.1415926报错3+5数print3*4print=3**4print5/2print5.0/2128122.5顺术print(1+3)*2print=3*3**21627单对进数string1=“Red”须数string2=“Hat”printstring1+string2print=3*”Love”RedHatLoveLoveLove释这释string1=“Red”开这string2=“Hat”内printstri

3、ng1+string2#连接print=3*”Love”#复制3个RedHatLoveLoveLove数defmultiply(p1,p2)数printp1,”*”,p2,”=”,p1*p2数defdevide(p3,p4)printp3,”/”,p4,”=”,p3/p4v1=2.5v2=5.9multiply(v1,v2)devide(v1,v2)2.5*5.9=14.752.5/5.9=0.423728813559数围m=10defmultiply(p1):m=20printp1,"*",m,"=",p1*mdefdevide(p2):globalmprintp2,"/",m,"="

4、,p2/mv1=2v2=10multiply(v1)devide(v2)2*20=4010/10=1数数defex(x):数if(x>10):return1else:return0printex(20)printex(5)10数内数调importmathfrommathimport*printmath.sin(math.pi/2)printsin(pi/2)printmath.fabs(-5)printfabs(-5)1155调数defminus():0*0=00*1=0x=00*2=00*3=0y=00*4=00*5=0while(x<=9):0*6=0while(y<=9):0*7=

5、00*8=0printx,"*",y,"=",x*y0*9=01*0=0y=y+11*1=11*2=2x=x+11*3=3y=01*4=41*5=5minus()1*6=61*7=71*8=81*9=92*0=0数2*1=22*2=42*3=62*4=8级数结name="zhangzhenyu"name[0]=zprint"name[0]=",name[0]name[4]=gprint"name[4]=",name[4]lettle=aletter=name[2]name[a+b]=nprint"lettle=",letter14a=1b=2print"name[a+b]=",name[

6、a+b]计数address="www.stu.edu.cn"printlen(address)级数结历deftravel(string):zaindex=0hwhileindex

7、r'objectdoesnotsupportitemPythonassignment开结级数结importstring10printstring.find("www.baidu.com","com")11printstring.find("Ilovepython","o",5)3printstring.find("Ilovepython","o",1)-1printstring.find("Ilovepython","c",1,3)