<p>有人能告诉我那部分是什么吗thisLine.索引('(')-1])是吗?在</p>
<pre><code>def get_list_of_university_towns():
'''Returns a DataFrame of towns and the states they are in from the
university_towns.txt list. The format of the DataFrame should be:
DataFrame( [ ["Michigan", "Ann Arbor"], ["Michigan", "Yipsilanti"] ],
columns=["State", "RegionName"] )
The following cleaning needs to be done:
1. For "State", removing characters from "[" to the end.
2. For "RegionName", when applicable, removing every character from " (" to the end.
3. Depending on how you read the data, you may need to remove newline character '\n'. '''
data = []
state = None
state_towns = []
with open('university_towns.txt') as file:
for line in file:
thisLine = line[:-1]
if thisLine[-6:] == '[edit]':
state = thisLine[:-6]
continue
if '(' in line:
town = thisLine[:thisLine.index('(')-1]
state_towns.<a href="https://www.cnpython.com/list/append" class="inner-link">append</a>([state,town])
else:
town = thisLine
state_towns.append([state,town])
data.append(thisLine)
df = pd.DataFrame(state_towns,columns = ['State','RegionName'])
return df
</code></pre>
<p>获取大学城的列表()</p>