Python built-in functions - repr & str-Python Tutorial-php.cn

Home

Backend Development

Python Tutorial

Python built-in functions - repr & str

黄舟

Jan 19, 2017 pm 04:45 PM

Python built-in function - repr & str

repr & str

repr(object) & str(object)

The variable value is converted into a string Two mechanisms: the former's goal is accuracy, the latter's goal is readability
repr(object) returns a printable string representing the object.
This is consistent with the result obtained by conversion (backtick ``) processing.
As a normal function, you can use this operation, which is sometimes useful.
For most types, this function attempts to return a string. When passed to eval(), the same object will be generated,
(i.e. eval(repr(object)==object.) otherwise it will generate a A string enclosed in angle brackets,
contains the object type name and usually some additional information such as object name and object address.
A class can control its own instance by redefining the __repr__() member function regarding this function. Return value.
str(object) returns a printable friendly string representing the object.
For a string, the difference between
and repr(object) is that str(object) ) does not attempt to return a string passed to eval();
The goal is to return a printable string.
If no parameters are given, an empty string is returned (the same applies to classes, through _. The _str__() member controls its behavior)

>>> print repr("hello world!")
&#39;hello world!&#39;
>>> print repr(10000L)
10000L
>>> print str("hello world!")
hello world!
>>> print str(10000L)
10000
>>> temp = 42
>>> print "the temperature is "+temp
Traceback (most recent call last):
  File "<pyshell#18>", line 1, in <module>
    print "the temperature is "+temp
TypeError: cannot concatenate &#39;str&#39; and &#39;int&#39; objects
>>> print "the temperature is "+ `temp`
the temperature is 42
>>> print "the temperature is " + repr(temp)
the temperature is 42

The above is the content of Python’s built-in function-repr & str. For more related content, please pay attention to the PHP Chinese website (m.sbmmt.com)

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

The Main Purpose of Python: Flexibility and Ease of UseApr 17, 2025 am 12:14 AM

Python's flexibility is reflected in multi-paradigm support and dynamic type systems, while ease of use comes from a simple syntax and rich standard library. 1. Flexibility: Supports object-oriented, functional and procedural programming, and dynamic type systems improve development efficiency. 2. Ease of use: The grammar is close to natural language, the standard library covers a wide range of functions, and simplifies the development process.

Python: The Power of Versatile ProgrammingApr 17, 2025 am 12:09 AM

Python is highly favored for its simplicity and power, suitable for all needs from beginners to advanced developers. Its versatility is reflected in: 1) Easy to learn and use, simple syntax; 2) Rich libraries and frameworks, such as NumPy, Pandas, etc.; 3) Cross-platform support, which can be run on a variety of operating systems; 4) Suitable for scripting and automation tasks to improve work efficiency.

Learning Python in 2 Hours a Day: A Practical GuideApr 17, 2025 am 12:05 AM

Yes, learn Python in two hours a day. 1. Develop a reasonable study plan, 2. Select the right learning resources, 3. Consolidate the knowledge learned through practice. These steps can help you master Python in a short time.

Python vs. C : Pros and Cons for DevelopersApr 17, 2025 am 12:04 AM

Python is suitable for rapid development and data processing, while C is suitable for high performance and underlying control. 1) Python is easy to use, with concise syntax, and is suitable for data science and web development. 2) C has high performance and accurate control, and is often used in gaming and system programming.

Python: Time Commitment and Learning PaceApr 17, 2025 am 12:03 AM

The time required to learn Python varies from person to person, mainly influenced by previous programming experience, learning motivation, learning resources and methods, and learning rhythm. Set realistic learning goals and learn best through practical projects.

Python: Automation, Scripting, and Task ManagementApr 16, 2025 am 12:14 AM

Python excels in automation, scripting, and task management. 1) Automation: File backup is realized through standard libraries such as os and shutil. 2) Script writing: Use the psutil library to monitor system resources. 3) Task management: Use the schedule library to schedule tasks. Python's ease of use and rich library support makes it the preferred tool in these areas.

Python and Time: Making the Most of Your Study TimeApr 14, 2025 am 12:02 AM

To maximize the efficiency of learning Python in a limited time, you can use Python's datetime, time, and schedule modules. 1. The datetime module is used to record and plan learning time. 2. The time module helps to set study and rest time. 3. The schedule module automatically arranges weekly learning tasks.

Python: Games, GUIs, and MoreApr 13, 2025 am 12:14 AM

Python excels in gaming and GUI development. 1) Game development uses Pygame, providing drawing, audio and other functions, which are suitable for creating 2D games. 2) GUI development can choose Tkinter or PyQt. Tkinter is simple and easy to use, PyQt has rich functions and is suitable for professional development.

See all articles