Question

编程输入默认值

default = [1,2,3,4]  # Passing default list
L = raw_input("Enter a list  of numbers separated by comma:")
m = L.split(",")  # Spliing the list
if raw_input == None:  # If someone doesn't enter ANY INPUT
    raw_input = default
print default  # Trying to print default input
else:
    print list(m)

输出：

Enter a list  of numbers separated by comma : [PRESS ENTER]
Result:['']

Answer 1

如果您只按回车键，则raw_input为空字符串，而不是无。并且您不需要默认参数上的两颗星。

Answer 2

这是我的方法。您有一些语法错误和逻辑错误。我正在使用python 3，所以你可能想摆脱＆＃34;（）＆＃34;在打印陈述中

default = [1,2,3,4] 
L=raw_input("Enter a list  of numbers sepearted by comma:")
m=L.split(",") #Spliing the list
if m[0] == "": #If someone dont enter ANY INPUT
  print (default) #Trying to print default input
else:
 print m

希望有所帮助

以下是您的评论的答案

def just_a_function():
  default = [1,2,3,4] #Passing default list
  L=raw_input("Enter a list  of numbers sepearted by comma:")
  m=L.split(",") #Spliing the list
  if m[0] == "": #If someone dont enter ANY INPUT
    return default #Trying to print default input
  else:
    return m

x=just_a_function()
print(x)

Answer 3

default = [1,2,3,4] #Passing default list
L = input("Enter a list  of numbers separated by commas:")
L.split(',') if L else default

如果没有输入，raw_input不是None

3 个答案: