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People who want to learn Python will have a confusion, that is, Python currently has two versions, Python2 and Python3. What is the difference between Python2 and Python3? Which of the two versions should you learn?
python3 and python2 are incompatible, and the differences are relatively large. python3 is not backward compatible, but most components and extensions are based on python2. At present, most practical applications do not consider Python 3 for the time being. Sometimes, pay attention to writing code that is compatible with 2/3 chatgpt writing ideas . When writing new code mainly using Python2, you should consider the possibility of migrating to Python3 in the future. According to statistics, 10% currently use Python 3; 20% use both Python 2 and Python 3, with Python 2 used more; 70% use Python 2.
In fact, python is one of the most commonly used software on Linux, but most of the current versions of Linux still use python2. Moreover, there are more programs that rely on python2 on Linux, so it will take a few years for Python3 to replace python2 and become the mainstream. . If you still learn Python 2 to find a job, it is not difficult to switch from Python 2 to python3 after learning Python 2.
After talking for a long time, what is the difference between Python2 and Python3?
1.Performance
Py3.0 runs pystone benchmark 30% slower than Py2.5. Guido believes that Py3.0 has great room for optimization and can achieve good optimization results in string and integer operations.
The performance of Py3.1 is 15% slower than that of Py2.5, and there is still a lot of room for improvement.
2. Encoding
Py3.X source code files use utf-8 encoding by default, which makes the following code legal:
>>> China = 'china'
>>>print(China)
china
3. Grammar
1) Removed <> and replaced all with !=,
2) Remove `` and use repr() instead.
3) Add as and with as keywords, as well as True, False, None,
4) Integer division returns a floating point number. To get an integer result, please use //,
5) Add nonlocal statement. Peripheral (non-global) variables can be assigned directly using noclocal x,
6) Remove the print statement and add the print() function to achieve the same function. The same is true for the exec statement, which has been changed to the exec() function.
Python version and software download:
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