使用格式打印运行时可以包含未知数量变量的列表?

join

sample_list = ['cat', 'dog', 'bunny', 'pig']
printstr = '%s, and %s' % (', '.join(sample_list[:-1]), str(sample_list[-1]))
print("Your list of animals are: %s" % printstr)

sample_list = ['cat', 'dog', 'bunny', 'pig']
str_val = ""
l = len(sample_list) -1

for i, v in enumerate(sample_list):
    if i == l:
        str_val += " and {}".format(v)
    else:
        str_val += " {},".format(v)    

print("Your list of animals are: {}".format(str_val))

或一个班轮

str_val = "".join(" and {}".format(v) if i == l else " {},".format(v) for i, v in enumerate(sample_list))
print("Your list of animals are: {}".format(str_val))

输出:

Your list of animals are:  cat, dog, bunny, and pig

你可以创建你使用的字符串 format

sample_list = ['cat', 'dog', 'bunny', 'pig']
test='Your list of animals are: '+'{}, '*(len(sample_list)-1)+'and {}'
print(test) # Your list of animals are: {}, {}, {}, and {}
print(test.format(*sample_list)) # Your list of animals are: cat, dog, bunny, and pig

如果您使用的是Python3.5+,则可以使用f字符串,如:

sample_list = ['cat', 'dog', 'bunny', 'pig']
print(f"Your list of animals are: {', '.join([item for item in sample_list[:-1]])} and {sample_list[-1]}")

% 当输入数据时比 .format ,对于这个例子来说,这并没有什么大的区别,在我看来,人们应该习惯使用它们,因为它们是极好的:)