赋值前引用的局部变量"状态"

Question

我不明白为什么我在代码中有这个错误。"状态"是局部变量，我没有使用它以外的功能。

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"继续"。

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()