Python Csv Error: Sequence Expected

I am attempting to run the following code in Python, and am getting the error: csv.Error: sequence expected Does anyone have any idea what is wrong with my code? (The file was pr

Solution 1:

writer.writerow expects a sequence (a tuple or list) of values to write in a single row, with one value per column in that row. What you have given it instead is a single value. Your code really should look more like:

writer.writerow([tmp_STID, tmp_Times, tmp_T, tmp_RH])

and it looks to me like most of this code should be in a big loop, which runs once per station (and thus once per row).

---

dataCSV = open('ProgramCheck.csv', 'w') 
writer = csv.writer(dataCSV, dialect='excel')
writer.writerow(['Station ID', 'Time', 'Temperature' , 'Relative Humidity']) 

for line in inputData:
    tmp = line.split()

    tmp_STID = str(tmp[0])
    tmp_T = float(tmp[4]) 
    tmp_RH = float(tmp[3])
    tmp_Times = float(tmp[2])

    if tmp_T < 6.2and tmp_RH > 60.0: 
        writer.writerow([tmp_STID, tmp_Times, tmp_T, tmp_RH])

file.close()

Solution 2:

Right now it looks like you are trying to write just a string

  writer.writerow(variables)

will write the whole row

tmp_STID = str(tmp[0])
    tmp_T = float(tmp[4]) 
    tmp_RH = float(tmp[3])
    tmp_Times = float(tmp[2])

inspect the variables list

[tmp_STID, tmp_T, tmp_RH, tmp_Time]

also it looks like you are opening up a new csv file for each iteration? Should that be out of the loop?

Solution 3:

Well, try to think about what Python expect when you trying to use the "writeROW" method :) Entering just one value won't work, because every value will be in a different row, which is probably not what you trying to do. Instead, you might get all the values that are somehow related to each other in one set.

For example: The temprature is 26C on 16:35 at the Washington train station, with the humidity of 85%. This will be represented as: ["Washington", "16:35", 26, 85].