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2019-7-21 17:48 发布者: admin 评论 3 查看 1175

file = input("请输入要打开的文件：")demand = input("请输入必要体现的行数：")f = open(file)demand_1 = demand.split(":")[0]demand_2 = demand.split(":")[1]def begin(): print("文件" + file +

file = input("请输入要打开的文件：")
demand = input("请输入必要体现的行数：")

f = open(file)

demand_1 = demand.split(":")[0]
demand_2 = demand.split(":")[1]

def begin():
print("文件" + file + "从开始到第" + str(demand_2) + "行的内容如下：")
for i in range(int(demand_2)):
      print(f.readline())
f.close()

def middle():
print("文件" + file + "从" + str(demand_1) + "到第" + str(demand_2) + "行的内容如下：")
for i in range(int(demand_1)-1):
      f.readline()
num = int(demand_2) - int(demand_1)+ 1
for i in range(num):
      print(f.readline())
f.close()

def end():
print("文件" + file + "从" + str(demand_1) + "行到末了的内容如下：")
for i in range(int(demand_1)-1):
      f.readline()
num = len(list(f)) - int(demand_1)
for i in range(num):
      print(f.readline())
f.close()

if demand_1 == "":
begin()
elif demand_2 == "":
end()
else:
middle()

我在输入界面输入“1：”大概“2：”的时间，可以正常进入end函数，但是打印不出东西，叨教这是那里有标题，谢谢

表明 2019-07-21 174814.jpg