Python 错误 : read the contents in a file into variable

Question

我在 shell 中成功地做到了这一点

readonly FILE="/home/xxxx/file.txt"
text=$(cat ${FILE})

在 python 中尝试相同的方法

text = open('file.txt').read()
print text

我正在尝试这个，但出现错误:

Traceback (most recent call last):
  File "C:\Python27\lib\runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "C:\Python27\lib\runpy.py", line 72, in _run_code
    exec code in run_globals
  File "C:\Python27\lib\py_compile.py", line 170, in <module>
    sys.exit(main())
  File "C:\Python27\lib\py_compile.py", line 162, in main
    compile(filename, doraise=True)
  File "C:\Python27\lib\py_compile.py", line 106, in compile
    with open(file, 'U') as f:
IOError: [Errno 22] invalid mode ('U') or filename: ''

谢谢!

Answer 1

回溯中的这一行:IOError: [Errno 22] invalid mode ('U') or filename: '' 告诉我你正在为上下文管理器提供一个空字符串作为文件名.确保定义了变量 file。