python文件学习笔记
python文件
两种格式：文本和二进制
f.open()
f.close()
f.read()
f.readline()
f.write()
f.writeline()
f.tell()
f.seak(offset,from)在文件中移动指针从from移动offset个字节
e.g.
split():
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>>> str1 = 'aaa:bbbbbb'
>>> (front,end) = str1.split(':')
>>> front
'aaa'
>>> end
'bbbbbb'
>>> str1 = 'aaa:bbbbbb:cccc'
>>> (front,end) = str1.split(':')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: too many values to unpack (expected 2)
>>> (front,end) = str1.split(':',1)
>>> (front,mid,end) = str1.split(':')
>>> mid
'bbbbbb'
>>> type(str1.split(':'))
<class 'list'>
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OS模块
getcwd() 返回当前目录
mkdir()
makedirs()
remove()
rmdir()
removedirs()
system()
listdir()
chdir()
os.path.?
os.path.dirname()
pickle模块
存储，恢复类、对象、列表等数据
e.g.
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import pickle
dic1 = {
'a':1,
'b':2,
'c':3
}
pickle_file = open('filename.pkl','wb')
pickle.dump(dic1,pickle_file)
pickle_file.close()
#recover
pickle_file = open('filename.pkl','rb')
dic2 = pickle.load(pickle_file)
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