在 Python 中读入多个文件并将它们一个一个保存在不同的目录中答案

【问题标题】：Reading in multiple files in Python and saving them one by one in a different directory在 Python 中读入多个文件并将它们一个一个保存在不同的目录中
【发布时间】：2020-08-19 09:18:55
【问题描述】：

    import glob
    import pandas as pd
    import seaborn as sns
    import numpy as np
    from scipy import signal
    import matplotlib.pyplot as plt
    
    files = glob.glob("Angular_position_*_*.csv")
    output = pd.DataFrame()
    
    for f in files:
        df = pd.read_csv(f)
        time = df.iloc[:,0]
        time = time.to_numpy()
        ynew = df.iloc[:,1:]
        ynew = ynew.to_numpy()
        
    
        lowPassCutoffFreq = 6.0 # Cut off frequency
        Sample_freq = 150; #Target sample frequency
        N = 2 # Order of the filter; In this case 2nd order
        Wn = lowPassCutoffFreq/(Sample_freq/2)  #Normalize frequency
    
        b, a = signal.butter(5, Wn, btype='low',analog=False,output='ba')
        #scipy.signal.butter(N, Wn, btype='low', analog=False, output='ba', fs=None)
    
        output = signal.filtfilt(b, a, ynew, axis=0)
        
     
        np.savetxt("enter directory path/Filtered_files/Filtered_Angular_position_*_*", output,   delimiter = ', ', newline = "\n")

我正在尝试读取目录中的所有文件，然后对它们进行低通滤波。之后，结果将一个接一个地保存，但不会保存在一个文件中。结果为每个文件提供了 3 列，理想情况下，我希望它们用标题命名，例如col1，col2，col3。

不使用 glob，我可以单独过滤所有文件，但我有 100 多个这样的文件。

任何帮助将不胜感激。

祝你好运，

【问题讨论】：

标签： python-3.x pandas numpy glob lowpass-filter

【解决方案1】：

除了标题名称之外，我已经部分解决了这个问题：

import glob
import pandas as pd
from tnorma import tnorma
import seaborn as sns
import numpy as np
from scipy import signal
import matplotlib.pyplot as plt

path = r'location_of_dir'

all_files = glob.glob(path + '/*.csv')
# yn = np.zeros(shape = (101,1))
# tn = np.zeros(shape = (101,1))
#ynew = []

yn = np.zeros(shape = (101,1))

for filename in all_files:
    df = pd.read_csv(filename, index_col=None, header=0)
    print(filename)
    foo = filename.split("/")[-1]
    #df = pd.read_csv(f)
    time = df.iloc[:,0]
    time = time.to_numpy()
    ynew = df.iloc[:,1:]
    ynew = ynew.to_numpy()
    #print(ynew)

    lowPassCutoffFreq = 6.0 # Cut off frequency
    Sample_freq = 150; #Target sample frequency
    N = 2 # Order of the filter; In this case 2nd order
    Wn = lowPassCutoffFreq/(Sample_freq/2)  #Normalize frequency

    b, a = signal.butter(5, Wn, btype='low',analog=False,output='ba')
    #scipy.signal.butter(N, Wn, btype='low', analog=False, output='ba', fs=None)

    output = signal.filtfilt(b, a, ynew, axis=0)
    #print (output)
    tn = np.linspace(0, 100, 101)     # new time vector for the new time-normalized data
    yn, tn, indie = tnorma(output, k=3, smooth =1, mask = None, show = False)
    
    np.savetxt("path_name/foldername/file"+ foo, yn, delimiter = ', ', newline = "\n")

但是，我很难将标题名称放在每个文件的 3 列中。

【讨论】：