Tcler 的 Python 学习概要：文件读写

Tcl 里面的 File IO

set fp [open $file "r"]
set line [gets $fp]
set text [read $fp 16]
set text [read $fp]
close $fp

• 文本读写：open $file "r"
• 二进制读写：open $file "rb"

Python 里面的 File IO

用open()函数打开文件。

fp = open(file_path, "rb")  # 打开文件
line = fp.readline()       # 读取一行
blob = fp.read(16)         # 读取16字节
blob = fp.read(-1)         # 读取直到文件结束
fp.close()

一种便捷的写法，可以省去close()的调用。

with open(file_path, "rb") as file:
    blob = file.read(-1)

文件读写示例

def read_text(file_path):
    with open(file_path, "r") as file:
      text = file.read(-1)  
    read text

def read_blob(file_path):
    with open(file_path, "rb") as file:
      blob = file.read(-1)  
    read blob

Python IO Class

• io.IOBase
• RawIOBase extend IOBase
  • FileIO(name, mode, ...)
• BufferedIOBase extend IOBase
  • BytesIO(b"abcdef")
  • BufferedReader(raw, ...
  • BufferedWriter(raw, ...)
  • BufferedRandom(raw)
  • BufferedRWPair(reader, writer, ...) 类似于一个 pipe
• TextIOBase extend IOBase
  • TextIOWrapper(buffer, ...)
  • StringIO("abcdef", "\n")
  • IncrementalNewlineDecoder