Python：读取csv并打印到控制台。 正在打印奇怪的字符

Question

I am reading from a csv file and printing to console in Python. The first printed line is including some odd characters at the beginning of the string. The file in its entirety is:

My code is:

import csv

with open("C:\\Users\\user\\key.csv") as file:
    reader = csv.reader(file)
    for row in reader:
        print(row)

the output is:

['john', '12345']
['jacob', '23456']
['jingle', '34567']
['heimer', '45678']

I do not know where the "" in the first line is coming from.

Answer 1

The "ï»" is a byte order mark (BOM) , which is used at the beginning of some Unicode files or streams to indicate the "endianness" of multi-byte encoding variants (UTF-16 or UTF-32), or, like in this case, to indicate that the file is using UTF-8. Using a BOM at the beginning of a UTF-8 file is optional, but some applications -- like Microsoft Excel -- will use a BOM to indicate that the file is using UTF-8.

If you're using Python 3 and you know that your file will be using UTF-8, you should be able to just add the encoding when you open the file:

with open("C:\\Users\\user\\key.csv", encoding="utf-8-sig") as file:
    reader = csv.reader(file)
    for row in reader:
        print(row)

Here's the Python documentation on this: https://docs.python.org/3/howto/unicode.html#reading-and-writing-unicode-data