路飛學城 - python7天集訓 - 直播課

直播內容：

文件操做

user_file =  open('user_info.txt','r+')

user_file.write('\n'+username)

user_file.close()

 

書    python cookbook 

 

2018/6/28

直播課

經常使用簡便編程語句：

1.  li = [1,2,3]

      li = [x*2 for x in li]         #li = [2,4,6]

2.   b = True if 1==1 else False    --> if 1== 1 :b = True  else: b = False

3.  li1 = ["name","age"]

     li2 = ["pizza",18]

      dic3 = dict(zip(li1,li2))     #dic3 = {"name":"pizza","age":18}  將兩列表對應成字典

 

4. open(file, mode)

mode = 

    'r'       open for reading (default)

    'w'       open for writing, truncating the file first

    'x'       create a new file and open it for writing

    'a'       open for writing, appending to the end of the file if it exists

    'b'       binary mode

    't'       text mode (default)

    '+'       open a disk file for updating (reading and writing)

    'U'       universal newline mode (deprecated)

   The default mode is 'rt' (open for reading text). For binary random

    access, the mode 'w+b' opens and truncates the file to 0 bytes, while

    'r+b' opens the file without truncation. The 'x' mode implies 'w' and

    raises an `FileExistsError` if the file already exists.