从csv读取时仅在第一个值中无法解释的前导空间

Question

我正在从.csv中读取某些值，并且由于某些原因，在第一个值的开头添加了空格。有人知道为什么会这样吗？

输入：

    with open('input.csv') as csv_file:
    csv_reader = csv.reader(csv_file)
    for row in csv_reader:

        host = row[0]
        destination = row[1]
        port = row[2]
        print("HOST")
        print(host)

输出：

请注意，input.csv在第一个值的开头没有空格。同样使用lstrip（）似乎无法解决此问题。

Answer 1

尝试

bitcoin

---

请注意：

 Traceback (most recent call last):
  File "C:/Users/SMA/PycharmProjects/HW2/keygen.py", line 3, in <module>
    from bitcoin.wallet import CBitcoinSecret, P2PKHBitcoinAddress
  File "C:\Users\SMA\PycharmProjects\HW2\venv\lib\site-packages\bitcoin\wallet.py", line 29, in <module>
    import bitcoin.core.key
  File "C:\Users\SMA\PycharmProjects\HW2\venv\lib\site-packages\bitcoin\core\key.py", line 33, in <module>
    _ssl = ctypes.cdll.LoadLibrary(ctypes.util.find_library('ssl') or 'libeay32')
  File "C:\Users\SMA\AppData\Local\Programs\Python\Python37\lib\ctypes\__init__.py", line 434, in LoadLibrary
    return self._dlltype(name)
  File "C:\Users\SMA\AppData\Local\Programs\Python\Python37\lib\ctypes\__init__.py", line 356, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 126] The specified module could not be found

skipinitialspace：如果设置为True，则分隔符之后的任何空白都将被忽略。

Answer 2

它可能是零宽度不间断空格（U + FEFF）代码点，并用作UTF16和UTF32编码文件的字节顺序标记（BOM），以及UTF-8编码文件的签名。 open('input.csv',encoding='utf-8-sig')不会将其删除。假设您的.CSV以UTF-8编码，使用utf16会删除签名（如果存在）。其他选项是utf32和print(ascii(host))。他们需要BOM并将其删除，但很可能是UTF-8。

使用>>> host = '\ufeffBob' >>> print(x) Bob >>> print(ascii(x)) '\ufeffBob' 来查看实际的字符：

{{1}}

Answer 3

 with open('input.csv') as csv_file:
    csv_reader = csv.reader(csv_file)
    for row in csv_reader:

        host = row[0]
        destination = row[1]
        port = row[2]
        print("HOST")
        print(host) #  Remove spaces by treating strings
        print(host.strip()) # Default is a blank character