Python能不能完整来代码，明天就要交了
b = 'beijing'
with open('city.txt','r',encoding='utf-8') as f:
a = f.readlines()
for i in range (0,len(a)):
if b in a[i]:
print(a[i])
break
如果你就是这样一个文本，这样循环取值应该可行，需要不设定大小写，就input后面接个lower
b = 'beijing'
with open('city.txt','r',encoding='utf-8') as f:
a = f.readlines()
for i in range (0,len(a)):
if b in a[i]:
print(a[i])
break
如果你就是这样一个文本，这样循环取值应该可行，需要不设定大小写，就input后面接个lower