一、求1-100的和:
方法1:阶层
def f(n):
if n==1:
return 1
else:
return n+f(n-1)
print f(100)
方法2:
a=0
for i in range(1,101):
a=a+i
print a
方法3:
a=[]
for i in range(1,101):
a.append(i)
print sum(a)
二、实现冒泡排序
方法1:
a=[2,1,4,5,6,3,1,8,9,0,0,6]
b=len(a)-1
while b>=0:
for i in range(b):
if a[i]>a[i+1]:
a[i],a[i+1]=a[i+1],a[i]
b=b-1
print(a)
方法2:
a=[2,3,4,2,4,5,5,6,5,5,7,8,5]
for j in range(len(a)-1,0,-1):
for i in range(0,j):
if a[i]>a[i+1]:
a[i],a[i+1]=a[i+1],a[i]
print a
三、去除重复项:
方法1:
a=[2,3,4,2,4,5,5,6,5,5,7,8,5]
b=[]
for i in a:
if i not in b:
b.append(i)
print b
方法2:
print(set(a))
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四、求一个数的因子:
number=[]
x=9
for y in range(1,x):
if x%y ==0:
number.append(y)
print(number)
五、求某个数各个位数之和:
x=1993
sum=0
for y in str(x):
sum+=int(y)
print(sum)
六、求x的n次方(n为整数)
def power(x,n):
if n>0:
s=x
while n>1:
s=s*x
n=n-1
return s
elif n==0:
s=1
return s
else:
s=1.0/x
while -n>1:
s=s*(1.0/x)
n=n+1
return s
七,打印这样一个数列【0,1,2,3,5,8,13,21 ...】:
def ff(n):
def f(x):
if x == 0:
return 0
elif x == 1:
return 1
else:
return f(x - 1) + f(x- 2)
a = f(n)
l = []
for i in range(n):
l.append(f(i))
print(l)