File is a named location on disk to store related information. It is used to permanently store data in a non-volatile memory (e.g. hard disk). Since, random access memory (RAM) is volatile which loses its data when computer is turned off, we use file…
From: http://learnpythonthehardway.org/book Comment with line comment: Ctrl + slash Run: Shift + F10 Next Break Point: F9 Run code partially in Console: Right Click + Execute Selection in Console English Learning: + plus - minus / slash * asterisk %…
1. get files in the current directory with the assum that the directory is like this: a .py |----dataFolder |----Myfolder |----1.csv , 2.csv, 3.csv # a.py 1 def getFileList(): file_list = [] cur_dir = os.getcwd() for folder in os.walk(cur_dir).next()…
python 文本对象 继承自C的stdio包 打开 可以用内置的open()函数创建 with open("hello.txt") as f: for line in f: print line 等效于旧版本的 f = open("hello.txt") try: for line in f: print line, finally: f.close() 注 Python中不是所有的"类文件式"类型支持用作with语句的上下文管理器. 打开模式…
file.open(name[,mode[,buffering]]) 模式的类型有: r 默认只读 w 以写方式打开,如果文件不存在则会先创建,如果文件存在则先把文件内容清空(truncate the file first)a 以追加模式打开 (从 EOF 开始, 必要时创建新文件)用seek也无用.打开的文件也是不能读的.r+ 以读写模式打开,如果文件不存在则报错,文件可读可写,可写到文件的任何位置w+ 以读写模式打开 (参见 w ),和r+不同的是,它会trun…