我在尝试在 Jupyter Notebook 中下载并加载一个数据集时遇到了问题，以下是我的代码：
import osimport tarfilefrom six.moves import urllibDOWNLOAD_ROOT = "https://raw.githubusercontent.com/ageron/handson-ml/master/"HOUSING_PATH = os.path.join("datasets", "housing")HOUSING_URL = DOWNLOAD_ROOT + "datasets/housing/housing.tgz"def fetch_housing_data(housing_url=HOUSING_URL, housing_path=HOUSING_PATH): if not os.path.isdir(housing_path): os.makedirs(housing_path) tgz_path = os.path.join(housing_path, "housing.tgz") urllib.request.urlretrieve(housing_url, tgz_path) housing_tgz = tarfile.open(tgz_path) housing_tgz.extractall(path=housing_path) housing_tgz.close()import pandas as pddef load_housing_data(housing_path=HOUSING_PATH): csv_path = os.path.join(housing_path, "housing.csv") return pd.read_csv(csv_path)housing = load_housing_data()housing.head()运行上述代码后，我得到了以下错误：
---------------------------------------------------------------------------FileNotFoundError Traceback (most recent call last)<ipython-input-5-6a9011700846> in <module>----> 1 housing = load_housing_data() 2 housing.head()<ipython-input-4-4d0bff7b3608> in load_housing_data(housing_path) 2 def load_housing_data(housing_path=HOUSING_PATH): 3 csv_path = os.path.join(housing_path, "housing.csv")----> 4 return pd.read_csv(csv_path)~/anaconda3/lib/python3.7/site-packages/pandas/io/parsers.py in parser_f(filepath_or_buffer, sep, delimiter, header, names, index_col, usecols, squeeze, prefix, mangle_dupe_cols, dtype, engine, converters, true_values, false_values, skipinitialspace, skiprows, nrows, na_values, keep_default_na, na_filter, verbose, skip_blank_lines, parse_dates, infer_datetime_format, keep_date_col, date_parser, dayfirst, iterator, chunksize, compression, thousands, decimal, lineterminator, quotechar, quoting, escapechar, comment, encoding, dialect, tupleize_cols, error_bad_lines, warn_bad_lines, skipfooter, doublequote, delim_whitespace, low_memory, memory_map, float_precision) 676 skip_blank_lines=skip_blank_lines) 677 --> 678 return _read(filepath_or_buffer, kwds) 679 680 parser_f.__name__ = name~/anaconda3/lib/python3.7/site-packages/pandas/io/parsers.py in _read(filepath_or_buffer, kwds) 438 439 # Create the parser.--> 440 parser = TextFileReader(filepath_or_buffer, **kwds) 441 442 if chunksize or iterator:~/anaconda3/lib/python3.7/site-packages/pandas/io/parsers.py in __init__(self, f, engine, **kwds) 785 self.options['has_index_names'] = kwds['has_index_names'] 786 --> 787 self._make_engine(self.engine) 788 789 def close(self):~/anaconda3/lib/python3.7/site-packages/pandas/io/parsers.py in _make_engine(self, engine) 1012 def _make_engine(self, engine='c'): 1013 if engine == 'c':-> 1014 self._engine = CParserWrapper(self.f, **self.options) 1015 else: 1016 if engine == 'python':~/anaconda3/lib/python3.7/site-packages/pandas/io/parsers.py in __init__(self, src, **kwds) 1706 kwds['usecols'] = self.usecols 1707 -> 1708 self._reader = parsers.TextReader(src, **kwds) 1709 1710 passed_names = self.names is Nonepandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader.__cinit__()pandas/_libs/parsers.pyx in pandas._libs.parsers.TextReader._setup_parser_source()FileNotFoundError: File b'datasets/housing/housing.csv' does not exist我尝试手动下载数据并将 .CSV 文件添加到同一文件夹中，使用以下代码可以正常工作：
import pandas as pdimport numpy as nppd.read_csv('housing.csv', delimiter = ',')我的问题是第一个代码段出了什么问题？我非常感谢任何人能解释一下。顺便说一下，我使用的是 Mac 10.14 系统。
注意：这段代码是来自《Hands on Machine Learning with Scikit Learn and Tensorflow》一书的示例。
回答：
def fetch_housing_data() 函数没有被调用，因此没有目录或下载的文件。你需要在 def load_housing_data 函数体内调用 fetch_housing_data() 函数
就像这样：
def load_housing_data(housing_path=HOUSING_PATH): # 缺少调用获取数据的函数 fetch_housing_data() csv_path = os.path.join(housing_path, "housing.csv") return pd.read_csv(csv_path)