print(s[i])
i+=1
for循环
s=input('Enterastring:
')
foriins:
print(i)
2-8
while循环
print('Enterfivenumber')
v=[]
i=0
s=0
whilei<5:
a=input('n%d='%(i+1))
v.extend([int(a)])
s=s+v[i]
i+=1
print(v)
print('sum=%d'%s)
for循环
print('Enterfivenumber')
v=[]
s=0
foriinrange(5):
a=input('n%d='%(i+1))
v.extend([int(a)])
s=s+v[i]
print(v)
print('sum=%d'%s)
2--9
print('Enterfivenumber')
v=[]
s=0
foriinrange(5):
a=input('n%d='%(i+1))
v.extend([int(a)])
s=s+v[i]
print(v)
print('ave=%f'%(float(s)/len(v)))
2-10
i=1
whilei:
n=int(input('Enteranumberbetween1-100:
'))
ifn<=100andn>=1:
print('Done')
i=0
else:
print('Error')
2-11
whileTrue:
s=0
c=int(input("'1'sum,'2'ave,'0'exit:
\n"))
ifc==1:
foriinrange(5):
n=int(input('n%d='%(i+1)))
s+=n
print(s)
if c==2:
foriinrange(5):
n=int(input('n%d='%(i+1)))
s+=n
print(float(s/5))
ifc==0:
break
2-15
a=int(input('a='))
b=int(input('b='))
c=int(input('c='))
n=[]
ifa>b:
a,b=b,a
if a>c:
a,c=c,a
if b>c:
b,c=c,b
n.extend([a,b,c])
print(n)
第三章;
importos
ls=os.linesep
defwrite():
whileTrue:
fname=input('Enterfilename:
')
ifos.path.exists(fname):
print('Error%salreadyexists'%fname)
else:
break
all=[]
print("\nEnterlines('.'byitselftoquit).\n")
whileTrue:
entry=input('>')
ifentry=='.':
break
else:
all.append(entry)
fobj=open(fname,'w')
fobj.writelines(['%s%s'%(x,ls)forxinall])
fobj.close()
print('Done')
defread():
whileTrue:
fname=input('Enterfilename:
')
ifnotos.path.exists(fname):
print('sorry,%sisnotexists'%fname)
else:
break
try:
fobj=open(fname,'r')
exceptIOErrorase:
print("***fileopenerror",e)
else:
foreachlineinfobj:
print(eachline),
fobj.close()
i=0
whilei!
='q':
i=input("'r'read,'w',write,'q'quite:
")
ifi=='r':
read()
elifi=='w':
write()
第四,五章
4-1
python对象的三个属性,身份,类型,值(ID,type,value)
除了值之外其他两个都是只读的
如果对象支持更新操作,那么他的值就是可改变的,否也是只读的
5-2
defmul(a,b):
m=a*b
return(m)
x=int(input('x='))
y=int(input('y='))
print(mul(x,y))
5-3
defgrade(a):
ifa>100ora<0:
print("error,please,inputyourscorebetween1to100")
elifa>=90:
print("A")
elifa>=80:
print("B")
elifa>=70:
print("C")
elifa>=60:
print("D")
else:
print("F")
whileTrue:
x=int(input("Enteryourscore:
"))
ifx==0:
break
else:
grade(x)
5-4
defly(y):
if(y%100!
=0andy%4==0)ory%400==0:
print('%disleapyear'%y)
else:
print('%disnotleapyear'%y)
whileTrue:
x=int(input('Entertheyear:
'))
ifx==0:
break
else:
ly(x)
5-5
defcd(m0):
ifm0<0orm0>1:
print('Error,请输入0到1之间的金额')
else:
m=m0*100
a=m/25
a1=m%25
b=a1/10
b1=a1%10
c=b1/5
c1=b1%5
d=c1
print('%f美元=25美分x%d+10美分x%d+5美分x%d+1美分x%d'%(m0,a,b,c,d))
whileTrue:
m0=float(input('请输入金额:
'))
ifm0==0:
break
else:
cd(m0)
5-6
whileTrue:
s=input('请输入要计算的式子:
\n')
ifs==0:
break
else:
ifs.find('*')!
=-1:
ls=s.split('*')
print(float(ls[0])*float(ls[1]))
elifs.find('+')!
=-1:
ls=s.split('+')
print(float(ls[0])+float(ls[1]))
elifs.find("^")!
=-1:
ls=s.split("^")
print(float(ls[0])**float(ls[1]))
elifs.find('/')!
=-1:
ls=s.split('/')
print(float(ls[0])/float(ls[1]))
elifs.find('%')!
=-1:
ls=s.split('%')
print(float(ls[0])%float(ls[1]))
5-8
importmath
defsqcu():
a=float(input('输入正方形或立方体的边长:
'))
print('边长为',a,'的正方形面积是',round(a*a,3))
print('边长为',a,'立方体体积是',a**3)
defcisp():
r=float(input('输入圆或球的半径:
'))
print('半径为',r,'的圆面积是',round(math.pi*(r**2),3))
print('半径为',r,'的球的体积是',round(math.pi*(r**3)*4/3,3))
sqcu()
cisp()
5-10
defFtoC():
f=float(input('输入华氏温度:
'))
c=(f-32)*(5/9)
print(f,'华氏度等于',round(c,3),'摄氏温度')
FtoC()
5-11
defevod():
e=[]
o=[]
foriinrange(21):
ifi%2==0:
e.append(i)
else:
o.append(i)
print('偶数:
',e,'\n奇数:
',o)
defjudiv():
a,b=int(input('enterthefirstnumber:
')),int(input('enterthesecondnumber:
'))
ifa%b==0:
print(a,'能被',b,'整除')
else:
print(a,'不能被',b,'整除')
evod()
judiv()
5-13
defhmtom():
hm=input("输入时间(格式'hh:
mm'):
")
lhm=hm.split(':
')
m=float(lhm[0])*60+float(lhm[1])
print(m)
hmtom()
5-15
defgcd():
a,b=int(input('a=')),int(input('b='))
t1,t2=a,b
whileb!
=0:
ifa a,b=b,a
else:
a,b=b,a%b
print('最大公约数是%d,最小公倍数是%d'%(a,t1*t2/a))
gcd()
5-16
defpayment():
s=float(input('Enteropeningbalance:
'))
p=float(input('Entermonthlypayment:
'))
print("Pymt# Paid RemainingBalance")
print("------- ------- -----------")
n=0
print(n," ",p," ",round(s,2))
whiles>=p:
s=s-p
n=n+1
print(n," ",p," ",round(s,2))
print(n," ",round(s,2)," ",p)
whileTrue:
payment()
5-17
importrandom
l=[]
i=0
N=random.randint(2,100)
whilei n=random.randint(0,2**31)
l.append(n)
i+=1
print(l)
print('\n')
forxinrange(len(l)):
foryinrange(x,len(l)):
ifl[x] l[y],l[x]=l[x],l[y]
print(l)