Question

我是五个要在python中读取的.xpt数据文件。我想将这些文件中的数据生成一个数组。这是一个机器学习项目。我正在尝试使用此代码，但在“使用xport.Reader（fname）作为读者：”行上遇到错误。虽然我仍然不确定是否解决此错误会解决整个代码还是现在。我还有其他方法可以使用吗？

# imports to read the xpt file data 
import xport
import numpy as np
import os

#read the xpt file data
FN = ["BMX.XPT", "BMX_B.XPT", "BMX_C.XPT", "BMX_D.XPT", "BMX_E.XPT"]

def get_data(fname):
    Z={}
    H=None

    with xport.Reader(fname) as reader:
        for row in reader:

            if H is None:
                H=row.keys()
                H.remove("SEQN")
                H.sort()
            Z[row["SEQN"]] = [row[k] for k in H]

    return Z,H

# call get_data method on each file
D,VN =[],[]
for fn in FN:
    fn_full = os.path.join("../Data/", fn)
    X,H = get_data(fn_full)
    s = fn.replace(".XPT", "")
    H = [s + ":" + x for x in H]
    D.append(X)
    VN += H

## The sequence numbers that are in all data sets
KY = set(D[0].keys())
for d in D[1:]:
    KY &= set(d.keys())
KY = list(KY)
KY.sort()

def to_float(x):
    try:
        return float(x)
    except ValueError:
        return float("nan")

## Merge the data
Z = []
for ky in KY:

    z = []

    map(z.extend, (d[ky] for d in D))
    ## equivalent to
    ## for d in D:
    ##     z.extend(d[ky])

    z = [to_float(a) for a in z]
    ## equivalent to
    ## map(to_float, z)

    Z.append(z)

Z = np.array(Z)

Answer 1

似乎xport.reader的输入应该是文件而不是字符串。您应该将其作为文件打开，而不是将文件名作为参数传递。

例如

with xport.Reader(open(fname, ‘r’)) as reader:
    ....

尝试读取XPT文件时如何解决Python中'str'对象没有属性'tell''错误？

1 个答案: