Python学习之路

﹏ヽ暗。殇╰゛Y 2022-02-20 04:51 236阅读 0赞

Python 十分钟入门  [http://www.runoob.com/w3cnote/python-ten-minute-introductory-tutorial.html][http_www.runoob.com_w3cnote_python-ten-minute-introductory-tutorial.html]

Python 菜鸟教程  [http://www.runoob.com/python/python-tutorial.html][http_www.runoob.com_python_python-tutorial.html]

PyCharm安装Numpy  [https://jingyan.baidu.com/article/3aed632ed414d5701080912e.html][https_jingyan.baidu.com_article_3aed632ed414d5701080912e.html]

**python 文件读取**

with open(xml_path, "r") as fr:
            content = fr.read()

python读取文件时提示"UnicodeDecodeError: 'gbk' codec can't decode byte 0x80 in position 205: illegal multibyte sequence"

解决办法1.

with open(xml_path, "r", encoding="UTF-8") as fr:
            content = fr.read()

解决办法2.

with open(xml_path, "rb") as fr:
            content = fr.read()

Python 操作符

1. and 比 or 有更高的优先级

2. x^y 在 python中为 x\*\*y

Python类class中方法的self问题，

### self代表类的实例，而非类 ###

类的方法与普通的函数只有一个特别的区别——它们必须有一个额外的**第一个参数名称**, 按照惯例它的名称是 self。

#!/usr/bin/python
    # -*- coding: UTF-8 -*-
    
    class Employee:
        '所有员工的基类'
        empCount = 0
    
        def __init__(self, name, salary):
            self.name = name
            self.salary = salary
            Employee.empCount += 1
    
        def displayCount(self):
            print("Total Employee %d" % Employee.empCount)
    
        def displayEmployee(self):
            print("Name : ", self.name, ", Salary: ", self.salary)
    
    t = Employee("sff", "1000")
    t.displayEmployee()

Python缩进问题：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21hc3RlclNoYXc_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21hc3RlclNoYXc_size_16_color_FFFFFF_t_70 1][]

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[http_www.runoob.com_python_python-tutorial.html]: http://www.runoob.com/python/python-tutorial.html
[https_jingyan.baidu.com_article_3aed632ed414d5701080912e.html]: https://jingyan.baidu.com/article/3aed632ed414d5701080912e.html
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21hc3RlclNoYXc_size_16_color_FFFFFF_t_70 1]: /images/20220220/8a93d62660c645f9a042076008b4fa38.png