Question

我正在尝试使用python读取CSV文件以用于数据科学，但收到错误消息“未找到年末ail-length-km-km”。

我尝试过将文件直接移动到D驱动器，因此编写路径导向器不会有任何错误。我尝试使用另一个测试文件，它可以工作。

title = "Length of rails"
titlelen = len(title)
print("{:*^{titlelen}}".format(title, titlelen=titlelen+6))
print()

data = np.genfromtxt('d:\rail-length-km-at-end-of-year',
                     skip_header=1,
                     dtype=[('year','U10'),('rail_type','U50'), 
('length','i8')], delimiter=",",
                     missing_values=['na','-'],filling_values=[0])

x_public = data[data['rail_type']=='public sector']['year']
y_public = data[data['rail_type']=='public sector']['length']

x_private = data[data['rail_type']=='Private Sector']['year']
y_private = data[data['rail_type']=='Private Sector']['length']

fig = plt.figure()
ax1 = fig.add_subplot(111)


ax1.plot(x_public, y_public, c='b',  label='Public Sector')
ax1.plot(x_private,y_private, c='r', label='Private Sector')
plt.ylabel('rail length')
plt.legend(loc='upper left');

plt.show()

Python无法识别文件目标

Answer 1

\字符是转义字符。这就是为什么错误消息开头不显示“ r”的原因-它被转义了：

“未找到年底的所有长度。”

\r是回车符。要获得正确的路径，您必须通过在其前面添加另一个\来逃避\

data = np.genfromtxt('d:\\rail-length-km-at-end-of-year',

或仅使用正斜杠

data = np.genfromtxt('d:/rail-length-km-at-end-of-year',

找不到CSV档案

1 个答案: