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#1 Created at ... [Delete] [Delete and Lock User]

a=int(input('请输入a的值：'))
if a>=0:
    print(a,'是非负数，绝对值为',a)
else:
    print(a,'是负数，绝对值为',-a)

#2 Created at ... [Delete] [Delete and Lock User]

我尝试了用你的代码，但是命令提示符一直说第二行if出了问题，求解

a=input('please enter a')
if a>=0
    print(a,'是非负数，绝对值为'，a)
else,
    print(a,'是负数，绝对值为'，-a)

#3 Created at ... [Delete] [Delete and Lock User]

else后面的“，”改了也没用，是if行出错了

#4 Created at ... [Delete] [Delete and Lock User]

你的if行后面少了个冒号

#5 Created at ... [Delete] [Delete and Lock User]

改了之后还是不行，还是那一行，invalid character in identifier

#6 Created at ... [Delete] [Delete and Lock User]

你的a和>之间应该有个空格

#7 Created at ... [Delete] [Delete and Lock User]

=和0之间也应该有个空格

#8 Created at ... [Delete] [Delete and Lock User]

谢谢之前没有看到你的回复。学到后面发现是需要首先把input的内容转换成int类的。因为input进去的内容是算作字符串的。