Python:从命令行参数读取文件名
我正在制作一个简单的脚本,从谷歌表单生成的csv文件中计算一些值 脚本如下:Python:从命令行参数读取文件名,python,python-2.7,Python,Python 2.7,我正在制作一个简单的脚本,从谷歌表单生成的csv文件中计算一些值 脚本如下: import csv import os.path fileName=None if __name__=="__main__": try: fileName=argv[1] isFile(fileName) pass except Exception as e: print("You must provide a valid filen
import csv
import os.path
fileName=None
if __name__=="__main__":
try:
fileName=argv[1]
isFile(fileName)
pass
except Exception as e:
print("You must provide a valid filename as parameter")
raise
def isFile(fileName):
if(not os.path.isfile(fileName)):
raise ValueError("You must provide a valid filename as parameter")
print fileName
def readCsvAndCountPercentPerFormItemFromGoogleForms(fileName):
times={}
totalRows=0
with open(fileName,'r') as csvfile:
csvReader=csv.reader(csvfile);
for row in csvreader:
value=row[1]
if(value in times.values()):
times[value]+=1
else:
times[value]=1
totalRows+=1
return calculateDictionaryAsPercent(times,totalRows)
def calculateDictionaryAsPercent(times,totalRows):
if(totalRows==0):
raise ValueError("The file does not contain any rows")
for key,val in times.items():
times[key]=(val/totalRows)*100
return times
finalTimes=readCsvAndCountPercentPerFormItemFromGoogleForms(fileName)
print finalTimes
但我得到了以下错误:
Traceback (most recent call last):
File "csv.py", line 1, in <module>
import csv
File "/home/pcmagas/Kwdikas/python/csv.py", line 54, in <module>
finalTimes=readCsvAndCountPercentPerFormItemFromGoogleForms(fileName)
File "/home/pcmagas/Kwdikas/python/csv.py", line 26, in readCsvAndCountPercentPerFormItemFromGoogleForms
with open(fileName,'r') as csvfile:
TypeError: coercing to Unicode: need string or buffer, NoneType found
下面的代码是根据在上找到的第一个答案编写的
因此,您可以为我提供一个解决方案,因为我不太经常编写python,因此为了更好地学习它,我编写了以下脚本
编辑1
代码已重新格式化为:
import csv
from sys import argv
import os.path
def isFile(fileName):
if(not os.path.isfile(fileName)):
raise ValueError("You must provide a valid filename as parameter")
def readCsvAndCountPercentPerFormItemFromGoogleForms(fileName):
times={}
totalRows=0
with open(fileName,'r') as csvfile:
csvReader=csv.reader(csvfile);
for row in csvreader:
value=row[1]
if(value in times.values()):
times[value]+=1
else:
times[value]=1
totalRows+=1
return calculateDictionaryAsPercent(times,totalRows)
def calculateDictionaryAsPercent(times,totalRows):
if(totalRows==0):
raise ValueError("The file does not contain any rows")
for key,val in times.items():
times[key]=(val/totalRows)*100
return times
fileName=None
if __name__=="__main__":
try:
fileName=argv[1]
print("Filename: ",fileName)
isFile(fileName)
pass
except Exception as e:
print("You must provide a valid filename as parameter")
raise
print("Filename: ",fileName)
finalTimes=readCsvAndCountPercentPerFormItemFromGoogleForms(fileName)
print finalTimes
仍然是相同的错误。最后,如前所述,脚本应该是这样的:
import csv
from sys import argv
import os.path
def readCsvAndCountPercentPerFormItemFromGoogleForms(fileName):
times={}
totalRows=0
with open(fileName,'r') as csvfile:
csvReader=csv.reader(csvfile);
for row in csvReader:
value=row[1]
if(value in times.values()):
times[value]+=1
else:
times[value]=1
totalRows+=1
return calculateDictionaryAsPercent(times,totalRows)
def calculateDictionaryAsPercent(times,totalRows):
if(totalRows==0):
raise ValueError("The file does not contain any rows")
for key,val in times.items():
times[key]=(val/totalRows)*100
return times
def isFile(fileName):
if(not os.path.isfile(fileName)):
raise ValueError("You must provide a valid filename as parameter")
fileName=None
if __name__=="__main__":
try:
fileName=argv[1]
isFile(fileName)
pass
except Exception as e:
print("You must provide a valid filename as parameter")
raise
finalTimes=readCsvAndCountPercentPerFormItemFromGoogleForms(fileName)
print finalTimes
您必须先定义isFilefileName:然后再尝试调用它。您的文件名似乎为csv.py。无法在名为csv.py的文件中导入csv;它将直接导入自身。为文件选择其他名称。
import csv
from sys import argv
import os.path
def readCsvAndCountPercentPerFormItemFromGoogleForms(fileName):
times={}
totalRows=0
with open(fileName,'r') as csvfile:
csvReader=csv.reader(csvfile);
for row in csvReader:
value=row[1]
if(value in times.values()):
times[value]+=1
else:
times[value]=1
totalRows+=1
return calculateDictionaryAsPercent(times,totalRows)
def calculateDictionaryAsPercent(times,totalRows):
if(totalRows==0):
raise ValueError("The file does not contain any rows")
for key,val in times.items():
times[key]=(val/totalRows)*100
return times
def isFile(fileName):
if(not os.path.isfile(fileName)):
raise ValueError("You must provide a valid filename as parameter")
fileName=None
if __name__=="__main__":
try:
fileName=argv[1]
isFile(fileName)
pass
except Exception as e:
print("You must provide a valid filename as parameter")
raise
finalTimes=readCsvAndCountPercentPerFormItemFromGoogleForms(fileName)
print finalTimes