[英]Python Preventing Duplicates in User-Generated Integer List, While-loop and Try-Except
I want the user to input 10 unique integers in the set [1, 100]. 我希望用户在集合[1,100]中输入10个唯一整数。 This is my code so far:
到目前为止,这是我的代码:
user_list = []
print "\nChoose any 10 discrete integers in the set [1, 100]. Do not choose duplicates."
i = 1
while i < 11:
try:
number_choice = int(raw_input("\nNumber %d?\n> " % i))
if (0 <= number_choice <= 100) and isinstance(number_choice, int):
i += 1
user_list.append(number_choice)
print "Your list so far: %r" % user_list
elif (number_choice < 0) or (number_choice > 100):
print "'I said to keep it in the set [1, 100].'"
pass
else:
pass
except ValueError:
print "'That isn't a discrete integer, is it?'"
print sorted(user_list)
To prevent duplicates, I wanted to change the first if
to read: 为了避免重复,我想改变第一
if
阅读:
if (0 <= number_choice <= 100) and (isinstance(number_choice, int)) and (number_choice not in user_list):
This would work, except it would just repeat the "Number %d?" % i
这会起作用,只不过会重复
"Number %d?" % i
"Number %d?" % i
prompt again if the user input a duplicate. 如果用户输入重复项,
"Number %d?" % i
再次提示。 How can I modify this code so it first displays a prompt 'I said no duplicates.'
如何修改此代码,使其首先显示提示
'I said no duplicates.'
and then resumes the loop? 然后恢复循环?
Before the i += 1
line: 在
i += 1
行之前:
if number_choice in user_list:
print 'No duplicates!'
continue
首先在if语句中检查重复项,然后检查有效的整数并将其添加到“ if else”中的列表中。
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