python名称错误名称未定义

Question

I get the error name not defined on running this code in python3:

def main():
    D = {} #create empty dictionary
    for x in open('wvtc_data.txt'):
        key, name, email, record = x.strip().split(':')
        key = int(key) #convert key from string to integer
        D[key] = {} #initialize key value with empty dictionary
        D[key]['name'] = name
        D[key]['email'] = email
        D[key]['record'] = record

print(D[106]['name'])
print(D[110]['email'])
main()

Could you please help me fix this?

Answer 1

Your variable D is local to the function main , and, naturally, the code outside does not see it (you even try to access it before running main ). Do something like

def main():
    D = {} #create empty dictionary
    for x in open('wvtc_data.txt'):
        key, name, email, record = x.strip().split(':')
        key = int(key) #convert key from string to integer
        D[key] = {} #initialize key value with empty dictionary
        D[key]['name'] = name
        D[key]['email'] = email
        D[key]['record'] = record
    return D

D = main()
print(D[106]['name'])
print(D[110]['email'])