关于字符串转换的小问题

没有土豆的洋芋

    Severitys=[]
    for row in reader:
        Severity=int(row[3])
        Severitys.append(Severity)

    print(Severitys)
程序如上 将字符串转换成数字 并打印出来
为什么我运行结果 是：  [] 里面并没有数字啊
求大神指教


还有 正确的程序应该怎么搞


reader：
import csv
from matplotlib import pyplot as plt

filename='F://London Accidents with GEO info apart.csv'
with open(filename) as f:
    reader=csv.reader(f)
    header_row=next(reader)
    print(header_row)
    for index,column_header in enumerate(header_row):
        print(index,column_header)


   
with open(filename) as f:
    reader=csv.reader(f)
    header_row=next(reader)
   
    Severitys=[]
    for row in reader:
        Severitys.append(row[3])
    print(Severitys)

    Severitys=[]
    for row in reader:
        Severity=int(row[6])
        Severitys.append(Severity)

    print(Severitys)

32269100

你贴reader出来再说吧