python file

以及循环递归..封装及笔记

文件操作

文件操作

import os
os.chdir('../p')
os.getcwd();#get file address

#I
data = open('sketch.txt')
data.seek(0);#return begin

each_line = data.readline();
# help(each_line.split)
# S.split(sep=None, maxsplit=-1) -> list of strings

for each_line in data:
	if each_line.find(':') != -1:
		try:
			(role,line_spoken) = each_line.split(':',1)
			print(role,end = '');
			print(' said: ',end = '');
			print(line_spoken,end = '');
		except:
		    pass
#O
out = open("data.out","w") #a -> append,w+ read & write
for eachS in other:
 	print(eachS,file = out)

out.close();

##python2(HBK)

#!/usr/bin/env python
# coding: utf-8
#copyRight by heibanke

########################## file ################
import codecs
f=codecs.open('file_ch.txt','w','utf-8') # 支持中文的打开

f.write(u'用python做些事\n')
f.write(u'黑板客\n')
f.write(u'网易云课堂\n')
f.close()

#read file
f=codecs.open('file_ch.txt','r','utf-8')
print f.readline() #read()是读取一个字符
print f.readline()
print f.readline()
f.close()
########################## os ################
import os
print os.path.exists('file_ch.txt')
os.rename('file_ch.txt', 'file_test.txt')
print os.path.exists('file_ch.txt')

shelve & pickle

#!/usr/bin/env python
# coding: utf-8
#copyRight by heibanke

########################## shelve ################
import shelve # 类似于字典,但是存在本地...
f = shelve.open('file_test.shelve')
f['baidu'] = 'www.baidu.com'
f['qq'] = 'www.qq.com'
f['163'] = 'www.163.com'

print f
f.close()
g = shelve.open('file_test.shelve')
print g


########################## pickle ################
print "--------------------------------------"
import cPickle
f=open('file_test.pkl','w')

obj1 = 2015,"heibanke",[1,2,3,4],{"python":1990,"java":1992}
obj2 = ['heibanke','junmin11','chutianshu1981','sjtujoe','ygkkv',
'liuyanping_0904','zhkmxx930']

cPickle.dump(obj1,f)
cPickle.dump(obj2,f)

f.close()

#read file
f=open('file_test.pkl','r')
obj1_r = cPickle.load(f)
print obj1_r

obj2_r = cPickle.load(f)
print obj2_r
f.close()

Others

HEADFIRST PYTHON

循环与递归

• python默认递归深度100

• 参考代码

  """递归打印多重列表"""
  递归打印多重列表
  """
  movies = ["The Holy Grail",
  			"The Life of Brian",
  			"The Meaning of Life",
  			[1,2,3]];
  
  def pt(List):
  	for a in List:# 
  		if isinstance(a,list):#判断类型
  			pt(a);
  		else:
  			print(a);
      # for a in range(0,len(List)):
  	# 	if isinstance(List[a],list):
  	# 		pt(List[a]);
  	# 	else:
  	# 		print(List[a]);
  pt(movies);

封装以及命名空间

1. nester.py放到一个文件夹中,加上setup.py

   from distutils.core import setup
   
   setup(
        name = 'nester',
        version = '1.0.0',
        py_modules = ['nester'],
        author = 'abc',
        author_email = '505636638@qq.com',#信息基本都是瞎写的= =
        url = "baidu.com",
        discription = '1',
       )

2. 在文件夹中执行

   python3 setup.py sdist;
   sudo python3 setup.py install

3. import后就可以通过命名空间执行了

   import nester
   nester.pt(nester.movies)
   #from nester import pt   <=> using namespace...
   #pt(nester.movies)

   ​

数据处理

line_spoken = line_spoken.strip()#去除不必要的空白
locals()#当前BIF中变量集合

第一本编程书笔记

• int(), str()对于类型的转化

• [a:b]对于数组的分片

• 函数传入参数可以(id = 1,)不按顺序传入

• print中sep表示分隔字符

• **为幂,//为整除

• 列表推倒:

  k = [n for n in range(1,10) if n % 2 == 0]
  g = {i:j.upper() for(i,j) in zip(range(1,6),'abcde')}

• 类的继承 在括号内写父类

exercise

#创造1-10.txt文本,以数字命名
def creater(name):
	name = name + '.txt'
	file = open('/users/macbook/desktop/' + name,'w')
	file.write('hello' + name)
	return file

for x in range(1,11):
	if(x < 10):
		creater('0' + str(x))
	else:
		creater(str(x))
	pass