python - 语法错误: invalid token python 3

Question

我的 Python 脚本有问题。当我运行这个Python脚本时:

class Student:
    def __init__(self,student_name,student_id,student_phone):
        self.student_name = student_name
        self.student_id = student_id
        self.student_phone = student_phone

obj = Student("ELizaa",1253251,16165544)

print("student name",obj.student_name,"\nstudent id",obj.student_id,"\nStudent phone",obj.student_phone)

工作正常。我得到了预期的输出。 但是当student_phone以0开头(例如0124575)时，我收到错误:

obj = Student("ELizaa",1253251,016165544)
                                         ^
SyntaxError: invalid token

为什么会发生这种情况？

Answer 1

在Python中，在任何数字前面添加0都需要额外的

• x(对于十六进制)后跟任意十六进制数字范围 0-9 或 a-f 或 A-F .

• o(八进制)后跟八进制数字范围 0-7 中的数字。

请看下面:

>>> 0o7
7
>>> 0o71
57
>>> 0o713
459
>>>
>>> 0xa
10
>>> 0xA
10
>>> 0x67
103
>>> 

» If you exceed the range or if you don't use x | o after 0.

>>> 0o8
  File "<stdin>", line 1
    0o8
     ^
SyntaxError: invalid token
>>> 
>>> 08
  File "<stdin>", line 1
    08
     ^
SyntaxError: invalid token
>>> 

Suggestion: If you are still willing to use 0 & want to perform operations on phones (for testing) then you can use the below approach to update the numbers.

Here we will store phone number as string & whenever we will update that, we will remove 0 from front, convert the remaining part into an integer, add (any operation) ant convert back to its original (0 in front) form & I think it is good.

>>> student_phone = "016165544"
>>> 
>>> # Add 3 to this
... 
>>> student_phone = "0" + str(int(student_phone.lstrip("0")) + 3)
>>> 
>>> student_phone
'016165547'
>>>  

最后，您可以通过这种方式调用(就像您在问题中已经做的那样，除了第二个)。

>>> class Student:
...     def __init__(self, student_name, student_id, student_phone):
...         self.student_name = student_name
...         self.student_id = student_id
...         self.student_phone = student_phone
... 
>>> obj = Student("ELizaa",1253251,16165544)
>>> print("student name",obj.student_name,"\nstudent id",obj.student_id,"\nStudent phone",obj.student_phone)
student name ELizaa 
student id 1253251 
Student phone 16165544
>>> 
>>> obj = Student("ELizaa",1253251,"016165544")                                
>>> print("student name",obj.student_name,"\nstudent id",obj.student_id,"\nStudent phone",obj.student_phone)
student name ELizaa 
student id 1253251 
Student phone 016165544
>>>