[英]Error reading csv file unicodeescape
我有这个程序
import csv
with open("C:\Users\frederic\Desktop\WinPython-64bit-3.4.4.3Qt5\notebooks\scores.txt","r") as scoreFile:
# write = w, read = r, append = a
scoreFileReader = csv.reader(scoreFile)
scoreList = []
for row in scoreFileReader:
if len (row) != 0:
scoreList = scoreList + [row]
scoreFile.close()
print(scoreList)
为什么会出现此错误?
使用open(“ C:\\ Users \\ frederic \\ Desktop \\ WinPython-64bit-3.4.4.3Qt5 \\ notebooks \\ scores.txt”,“ r”)作为scoreFile:^ SyntaxError:(unicode错误)'unicodeescape'编解码器无法解码位置2-3中的字节:截断的\\ UXXXXXXXX转义。
您需要将原始字符串与Windows样式的文件名一起使用:
with open(r"C:\Users\frederic\Desktop\WinPython-64bit-3.4.4.3Qt5\notebooks\scores.txt", 'r') as scoreFile:
^^
否则,Python的字符串引擎会认为\\ U是Unicode转义序列的开始-在这种情况下当然不是。
另外,请注意, scoreFile.close()
也无用:
with
语句替换try and catch。 阻止之后,它也会自动关闭文件。 这意味着您可以删除scoreFile.close()
行。
同样, if len(row) != 0
根据PEP8更改行:
对于序列(字符串,列表,元组),请使用空序列为假的事实。
是:如果不是seq:如果seq:
否:如果len(seq):如果不是len(seq):
最后一件事, for loop
也不好,要阅读csv
,最好先从doc复制示例!
with open('eggs.csv', 'rb') as csvfile:
spamreader = csv.reader(csvfile, delimiter=' ', quotechar='|')
for row in spamreader:
print ', '.join(row)
您可以尝试以下方法:
import csv
import io
def guess_encoding(csv_file):
"""guess the encoding of the given file"""
with io.open(csv_file, "rb") as f:
data = f.read(5)
if data.startswith(b"\xEF\xBB\xBF"): # UTF-8 with a "BOM"
return ["utf-8-sig"]
elif data.startswith(b"\xFF\xFE") or data.startswith(b"\xFE\xFF"):
return ["utf-16"]
else: # in Windows, guessing utf-8 doesn't work, so we have to try
try:
with io.open(csv_file, encoding="utf-8") as f:
preview = f.read(222222)
return ["utf-8"]
except:
return [locale.getdefaultlocale()[1], "utf-8"]
encodings = guess_encoding(r"C:\Users\frederic\Desktop\WinPython-64bit-3.4.4.3Qt5\notebooks\scores.txt")[0])
# then your code with
with open(r"C:\Users\frederic\Desktop\WinPython-64bit-3.4.4.3Qt5\notebooks\scores.txt","r", encoding=encodings[0]) as scoreFile:
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