python3-Read&；从&；到.csv

我试图从CSV文件（a）中读取数据，提取数据，然后将其写入另一个CSV文件（B）。在新文件B中，我想要两行。第一行应包含所有预定义变量，第2行应填充属于第1行中特定变量的所有值

（A）Python代码

import csv
from collections import defaultdict

data = defaultdict(str)

#Make a list with the predefined variables
definition = ["record_id", "abbreviation", "patient_id", "study_id",
"step_count", "distance", "ambulation_time", "velocity", "cadence",
"normalized_velocity", "step_time_differential", "step_length_differential",
"cycle_time_differential", "step_time", "step_length", "step_extremity",
"cycle_time", "stride_length", "hh_base_support", "swing_time",
"stance_time", "single_supp_time", "double_supp_time", "toe_in_out"]

#Read the GaitRite .csv
with open('C:/Users/Kay_v/Documents/School/Exports/Export 3.csv', 'r')  as f, open('C:/Users/Kay_v/Documents/School/Exports/result.csv', 'w') as outfile: 
    reader = csv.reader(f, delimiter=';')
    next(reader, None)  # skip the headers
    writer = csv.DictWriter(outfile, fieldnames=definition, lineterminator='\n')
    writer.writeheader()

#Read the .csv row by row
    for row in reader:
        #print(row)
        for item in definition:
            h = item.replace('_', '')
            r0 = row[0].lower().replace(' ', '')
            if h in r0:
                try:
                    avg = round((float(row[1].replace(',', '.')) + float(row[2].replace(',', '.'))) / 2, 2)
            except ValueError:
                avg = 0  # for cases with entry strings or commas
                #print(avg)
                print(h, r0, row[1], row[2])
                data[item] = row[1]

    data['record_id'] = 1

# Write the clean result.csv
    writer.writerow(data)

（B）所需输出

record_id  abbreviation  study_id  step_count  distance 
1                                  3           292,34

在“Moses Koledoye”的帮助下，我设法将大多数变量读写到一个干净的.csv文件中。我遇到的问题如下：

问题（1）

在result.csv（clean.csv输出文件）中，我缺少以下变量的值：

step_time
step_length
cycle_time  
stride_length   
hh_base_support 
swing_time  
stance_time 
single_supp_time    
double_supp_time    
toe_in_out

我使用这部分代码检查结果：

print(h, r0, row[1], row[2])

这给了我以下信息：

stepcount stepcount 3  
distance distance 292,34  
ambulationtime ambulationtime 1,67  
velocity velocity 175,1  
cadence cadence 107,8  
velocity normalizedvelocity ,  
normalizedvelocity normalizedvelocity ,  
steptimedifferential steptimedifferential 0,004  
steptime steptimedifferential 0,004  
steplengthdifferential steplengthdifferential 1,051  
steplength steplengthdifferential 1,051  
cycletimedifferential cycletimedifferential 0,008  
cycletime cycletimedifferential 0,008  
steptime steptime(sec) 0,558 0,554
steplength steplength(cm) 96,746 97,797
stepextremity stepextremity(ratio) , ,
cycletime cycletime(sec) 1,116 1,108
stridelength stridelength(cm) 192,159 197,122
hhbasesupport hhbasesupport(cm) 2,988 6,32
swingtime swingtime(sec) 0,466 0,466
stancetime stancetime(sec) 0,65 0,642
velocity stridevelocity 172,185 177,908
steptime steptimestddev , 0,006
stridelength stridelengthstddev , ,
swingtime swingtimestddev , ,
stancetime stancetimestddev , ,
velocity stridevelocitystddev , ,
singlesupptime singlesupptimestddev , ,
doublesupptime doublesupptimestddev , ,

从上面的输出中，您可以看到名称与多个字符串匹配时存在一些问题（如velocity），而有些名称根本不匹配（如toe_in_out）

问题（2）

另一个问题是将平均值包含到result.csv中。 我使用这部分代码来计算平均值，只要变量有两个值。但我希望这个平均值也包含在output result.csv中

try:
    avg = round((float(row[1].replace(',', '.')) + float(row[2].replace(',', '.'))) / 2, 2)
except ValueError:
    avg = 0  # for cases with entry strings or commas

我希望任何人能帮助我解决这些问题，将不胜感激

如果愿意，您可以使用导出文件。您可以在此处下载该文件：