Question

我不明白为什么我的代码中出现此错误。＆＃34; UnboundLocalError：局部变量＆＃39; state＆＃39;在分配之前引用＆＃34; 我的理解是变量＆＃34; state＆＃34;是一个局部变量，我没有在函数之外使用它。

def get_list_of_university_towns():

    with open("university_towns.txt") as townfile:
        unitowns=townfile.readlines()
    town_list=[]
    for line in unitowns:
        line.rstrip()
        if line[-6:]=="[edit]":
            state = line[:-6]

        elif ' (' in line:
            town = line[:line.index("(")-1]
            town_list.append([state,town])
        else:
            town = line
            town_list.append([state,town])
    unitown_pd=pd.DataFrame(town_list, columns=["State","RegionName"])
    return unitown_pd

get_list_of_university_towns()

Answer 1

我找到了答案。我需要在if中添加一个“continue”。

def get_list_of_university_towns():  
    import pandas as pd
    with open("university_towns.txt") as townfile:
        unitowns=townfile.readlines()
    #print(unitowns)
    town_list=[]
    for line in unitowns:
        line=line.rstrip()
        if line[-6:]=="[edit]":
            state = line[:-6]
            #print(state)
            continue

        elif ' (' in line:

            town = line[:line.index("(")-1]
            town_list.append([state,town])
        else:

            town = line
            town_list.append([state,town])
    unitown_pd=pd.DataFrame(town_list, columns=["State","RegionName"])        
    return unitown_pd.head()

局部变量＆＃39; state＆＃39;在分配之前引用

1 个答案: