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实现的简单python例子

2014-04-16 09:39 513 查看

本人学python没多久，不足的望指点

1.输入三个变量，然后按小到大输出

x = int(input('please input x:'))
y = int(input('please input y:'))
z = int(input('please input z:'))
if x > y :
x, y = y, x
if x > z :
x, z = z, x
if y > z :
y, z = z, y
print(x,y,z)

2.求101-200的素数

from math import sqrt
def isprime(n):
k = int(sqrt(n))
for i in range(2,k+1):
if n % i == 0:
return 0
return 1

if __name__ == '__main__':
for n in range(101, 201):
if isprime(n) ==1:
print(n, end = ' ')

版本二：

<pre name="code" class="python">n = int(input('please input n:'))
for i in range(2,n+1):
j = i
for j in range(2,n):
if i % j ==0:
break
if  j == i :
print(i,end=' ')

3.水仙花

for i in range(100,1000):
a = i%10
b = i%100//10
c = i//100
if a**3+b**3+c**3 == i:
print(i, end=' ')

4.分解质因子

n=int(input('please input n:'))
result=[]
i=2
str1=str(n)+'='
while n>1:
if n%i==0:
n/=i
result.append(str(i))
i -= 1
i +=1
str1+='*'.join(result)
print(str1)

函数版

def f(n):
result=[]
i=2
str1=str(n)+'='
while n>1:
if n%i==0:
n/=i
result.append(str(i))
i -= 1
i +=1
str1+='*'.join(result)
return str1

if __name__ == '__main__':
for i in range(80,100):
print(f(i))

5.统计字符串字符个数，空格字符个数，数字字符个数，其他字符个数

import string
s=input('please input string:')
letters = 0
space = 0
digit = 0
others =0
for ch in s:
if ch.isalpha():
letters += 1
elif ch.isspace():
space += 1
elif ch.isdigit():
digit += 1
else:
others += 1
print(letters, space , digit, others)

6.lamba 实现两数求最值

MAX = lambda x, y:(x>y)*x + (y>x)*y
MIN = lambda x, y:(x<y)*x + (y<x)*y
if __name__ == '__main__':
print('max={0} , min={1}'.format(MAX(10,2), MIN(10,2)))

7.输入一个整数，如果为奇数那么sum=1+1/3+.....+1/n

如果为偶数那么 sum=1/2+1/4+....+1/n

def f(n):
sum=0.0
if n%2 == 1:
for i in range(1, n+1, 2):
sum += 1/i
else:
for i in range(2, n+1, 2):
sum += 1/i
return sum
if __name__ == '__main__':
n=int(input('please input n:'))
print(f(n))

8.查找一个age最高的name

if __name__ == '__main__':
person = {'shao':23, 'wang':20, 'zhang':21, 'he':22}
flag = 1
maxk=''
for (k, v) in person.items():
if flag == 1:
maxk = k
flag = 0
else:
if person[maxk] < v:
maxk = k
print(maxk, person[maxk])

9.向文件里面输入一串字符

if __name__ == '__main__':
string = input('please input string:')
with open('f:/test.txt', 'a') as file:
file.write(string)
file.close()

10.python 对文件操作，两个磁盘文件A和B,各存放一行字母，要求把这两个文件中的信息合并（按字母顺序排序）

import string
if __name__ == '__main__':
with open('f:/A.txt', 'r') as file_A:
stringA=file_A.read()
with open('f:/B.txt', 'r') as file_B:
stringB=file_B.read()
stringA+=stringB
stringA=list(stringA)
stringA.sort()
stringA=''.join(stringA)
with open('f:/C.txt', 'a') as file_C:
file_C.write(stringA)
file_A.close()
file_B.close()
file_C.close()

11.python与json的转换

class Person(object):
def __init__ (self, name, age):
self.name = name
self.age = age
def __repr__(self):
return 'Person Object name:{0}, age{1}'.format(self.name, self.age)
if __name__ == '__main__':
p=Person('peter', 22)
print(p)

import person
import json
p=person.Person('shao', 22)
def object2dict(obj):
d={}
d['__class__'] = obj.__class__.__name__
d['__module__'] = obj.__module__
d.update(obj.__dict__)
return d
def dict2object(d):
if '__class__ ' in d:
class_name = d.pop('__class__')
module_name = d.pop('__module__')
module = __import__ (module_name)
class_ =getattr(module, class_name)
args = dict((key.encode('ascii'), value) for key, value in d.items())
inst = class_(**args)
else:
inst = d
return inst
d=object2dict(p)
print(d)
o=dict2object(d)
print(o)

12. 正则表达式

好的博文：

/article/5268064.html

计算字符串中float数据之和

import re
teststring = '123.33sdhf3424.34fdg323.324'
pattern = re.compile(r'\d+.\d*')
s=pattern.findall(teststring)
print(s)
print(sum([float(var) for var in s]))

正则表达式匹配问题
>>> s = '<html><head><title>Title</title>'
>>> pattern = re.compile('<.*?>')
>>> pattern.findall(s)
['<html>', '<head>', '<title>', '</title>']
>>> re.match('<.*?>',s).span()
(0, 6)

搞清楚贪心匹配与非贪心匹配之间的关系

正则表达式，子串代替问题
import re
p = re.compile('(blue|white|red)')
print(p.sub('colout', 'blue socket and red shoes'))
print(p.sub('colout', 'blue socket and red shoes', count=1))

>>>
colout socket and colout shoes
colout socket and red shoes

13.删除一个list重复的元素

List=list('sdfhskhdsssssdhkhk')
List.sort()
print(List)
for index in range(len(List)-1, 0, -1):
if  List[index] == List[index-1]:
del(List[index])
print(List)

最简单的

str = 'sdfhskdfsjdfljsdf'
list(set(str))

14.删除重复的list

z=[ [1,2] , [3,4] , [1,2] , [5,6] , [7,8] , [9,0] , [3,4] , [1,2] , [7,8] ]
z =[ repr(x) for x in z]
z = set(z)
z = [ eval(x) for x in z]
print(z)

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