🤵♂️ 个人主页: @计算机魔术师
👨💻 作者简介：CSDN内容合伙人，全栈领域优质创作者。
Python轻松上手
- 一、 编写第一个python.py
- 二、 固定数据介绍.py
- 三、 列表的性质以及增删改查.py
- 四、 小小的任务：求sinx曲线图形面积.py
- 五、 常用操作符.py
- 六、 条件判断语句.py
- 七、 字符串索引&切片&增删改查
- 八、 对文件处理操作
- 九、 统计小说的单词词频
- 十、 用户函数自定义
- 十一、 python方法与函数对比
- 十二、 面对对象实例
- 十三、 python模块
🎏 该篇讲解以代码和结果结合，能够快速上手python基础用法
源码： 传送门
; 一、 编写第一个python.py
print('hello world')
魔术师 = 666
print(魔术师)
print("Majician",魔术师)
print("Majiciam", 魔术师真酷, end='!')
print("Majiciam", 魔术师真酷, sep='-', end='!')
结果：
>>>print('hello world')
hello world
>>>魔术师真酷 = 666
>>>print(魔术师真酷)
666
>>>print("Majician", 魔术师真酷)
Majician 666
>>>print("Majiciam", 魔术师真酷, end='!')
Majiciam 666!
>>> print("Majiciam", 魔术师真酷, sep='-',end='!')
Majiciam-666!
二、 固定数据介绍.py
import math
a = -3.5
b = abs(a)
print(b)
c = math.sin(b)
print(c)
三、 列表的性质以及增删改查.py
all_in_list = [
1,
'love',
True,
[1, 2, 3]
]
print(all_in_list)
index = all_in_list[1]
index = all_in_list[-3]
index = all_in_list[0:2]
print(index)
all_in_list.append("hello world")
all_in_list.insert(0, "pre_hello")
print(all_in_list)
all_in_list.remove("hello world")
print(all_in_list)
del all_in_list[:2]
print(all_in_list)
all_in_list[0] = 100
print(all_in_list)
x = []
for i in range(10):
x.append(i)
x = [i for i in range(3,10)]
y = [i**2 for i in range(3,10)]
z = [i**2 for i in range(3,10) if i%2==0]
print(x)
print(y)
四、 小小的任务：求sinx曲线图形面积.py
import math
n = 10
x = []
y = []
width = 2 * math.pi / n
for i in range(n):
x.append(i * width)
y.append(abs(math.sin(x[i])))
sums = sum(y) * width
x = [i * width for i in range(n)]
y = [abs(math.sin(i * width)) for i in range(n)]
z = [abs(math.sin(i * width)) * width for i in range(n)]
sums = sum(z)
print(x)
print(y)
print(sums)
五、 常用操作符.py
res = 1 < 2 < 3
res = 'M' in 'Magic'
print(res)
六、 条件判断语句.py
if 1 < 2:
print('hello')
if 1 < 0:
print('hello')
else:
print("world")
if 1 < 0:
print('hello')
elif 1 < -1:
print("world")
else:
print("!")
x = [1, 2, 3, 4, 123, 1, 64, 1, -2]
n = len(x)
for i in range(n):
for j in range(i):
if x[j] > x[i]:
x[i], x[j] = x[j], x[i]
print(n)
print(x)
七、 字符串索引&切片&增删改查
string = "字符串"
string = '''hello
嘿嘿
world'''
string = 'my ,name'
print(string)
res = string[1]
res = string[1:4]
res = string * 3
res = string + ' is '
res = string.split(sep=',')
print(1,string)
string[1] = 'y'
res = string.upper()
print(res)
字典的创建 索引&增删改查
dictionary = {
'BIDU': 'baidu',
'SINA': 'sina',
'YOKU': 'youku',
}
dic = {'h': 'hello', 0.5: [0.3, 0.5], 'w': 'world'}
print(dic)
demo = dic['h']
demo = dic[0.5]
print(demo)
dic['h'] = 'hi'
dic['new'] = 'new dic'
dic.update({1: 2, 3: 4})
del dic['h']
d = {i: i ** 2 for i in range(10)}
d = {i: i ** 2 for i in range(10) if i % 2 == 0}
print(dic)
print(d)
八、 对文件处理操作
f = open('beauty_live.text', 'r')
txt = f.read()
txt = f.read(100)
f.seek(0)
txt1 = f.readlines()
f.close()
print(txt)
九、 统计小说的单词词频
import re
import os
path = os.getcwd()
print(path)
f = open('beauty_live.text', 'r')
txt = f.read()
f.close()
txt = txt.lower()
re.sub('[,.?!"\'-]', '', txt)
txt = txt.split()
word = {}
for i in txt:
if i not in word:
word[i] = 1
else:
word[i] += 1
sor = sorted(word.items(), key=lambda x: x[1], reverse=True)
print(txt)
print(word)
print(sor)
十、 用户函数自定义
y = lambda x: x ** 2
y1 = lambda x: x[1]
def Sum(x=1, y=2):
return x + y
res = Sum()
demo = y(3)
demo = y1(['hello', 'world'])
print(res)
print(demo)
def su(x):
z = 0
for i in x:
if i%2==0:
z +=1
return z
print(su([1,2,34,5,6,2,4,]))
十一、 python方法与函数对比
list = [2.4, 'hello', 'world']
list.append('hehe')
print(list)
string = 'myapp'
string.append('hi')
list.split()
print(string)
十二、 面对对象实例
class human:
def __init__(self, ag=None, se=None):
self.age = ag
self.sex = se
def square(self, x):
return x ** 2
zhangfei = human(ag=28, se='M')
demo = zhangfei.square(3)
demo = zhangfei.age
print(demo)
十三、 python模块
import math
import def_math
from def_math import Sum
res = math.sin(1)
res = math.pi
from math import sin, pi
from def_math import *
res = sin(2)
res = 2 * pi
res = def_math.Sum(1, 3)
res = Sum(1, 3)
print(res)
模块def_math.py
def Sum(x, y):
return x + y
Original: https://blog.csdn.net/weixin_66526635/article/details/124174983
Author: 计算机魔术师
Title: 【Python | 入门】 从输出打印到面对对象（五分钟速通Python）
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