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python基础语法1

  • 2026-06-30 14:46:49
python基础语法1
这里慢慢会更新Python学习记录
一.print 函数
print() 是python中常见的内置函数,用于将输出打印到控制台
直接输出
print("hello world")  print(123)  print("姓名","张三","年龄:",18)
格式化输出
f-string(推荐)
name = "张三” age = 18print(f"我叫{name},今年{age}岁")  #我叫张三,今年18岁#可以执行表达式print(f"10年后我{age + 10}岁”pi = 3.1415926print(f"{pi:.2f}")  #3.14rate = 0.856print(f"{rate:.1%}")  #85.6%print(f"{'居中':^10}")   # ‘     居中     ’print(f"{'左对齐':<10}")   # '左对齐      ’print(f"{'右对齐':>10}")    # '      右对齐’    
format()
name = "张三"age = 18#按位置print("我叫{},今年{}岁".format(name,age))#按名称print("我叫{name},今年{age}岁".format(name=name,age=age))pi = 3.1415926print("{.3f}".format(pi))   #3.142
%格式化
name = "张三" age = 18print("我叫%s,今年%d岁" %(name,age))
特殊参数
#sep:分隔符print("a","b","c",sep="-")   #a-b-c#end:结束符print("hello",end=" ")print("world")  #hello world#file:输出到文件with open("output.txt","w"as f:  print("写入文件",file=f)
注意事项
print(5+3)  #8print("5+3")   #5+3   (字符串拼接)print(5>3)   #Trueprint(len("abc"))   #3name = "李四"print(name)   #李四(变量值)print("name")  #name(字符串)
二.列表
定义:有序的可变序列类型,可以包含任意类型的元素,用[]表示,元素用逗号分隔
特点:有序,可变(可修改内容),可重复 ,可嵌套,动态
列表的创建方式
#1.直接创建list1 = [1,2,3]list2 = []#2.使用list()构造函数list3 = list("hello")     #['h','e','l','l','o']list4 = list(range(5))     #[0,1,2,3,4]list5 = list((1,2,3))      #元组(1,2,3)转列表[1,2,3]
列表推导式
基本语法:[表达式 for 变量 in 可迭代对象 if 条件]
squares = [x**2 for x in range(5)]   #生成平方数evens = [x for x in range(20if x%2 == 0]   #带条件的推导cycle = [i*j for i in range(3for j in range(3)]   #嵌套循环#生成一个列表[0,0,0,0,1,2,0,2,4]#等价于:cycle = []for i in range(3):    for j in range(3):        cycle.append(i*j)words = ['hello','world','python']upper_words = [word.upper() for word in words]     #修改为大写results = ['yes' if x%2 == 0 else 'no' for x in range(5)]
列表的访问与切片
#1.索引访问print(a[i])   #i的最小值为0,正索引从0开始,负索引从-1开始a = [[1,2,3],[4,5,6],[7,8,9]]element = a[1][2]    #6,第二行第三列#2.切片操作#基本切片[start:end](end不包含)#带步长的切片[start:stop:step]#切片赋值numbers[2:5] = [2,3,4]   #替换索引2-4的元素numbers[1:3] = []   #删除索引1-2的元素
列表的元素添加
.append()   #在末尾添加一个元素(作为整体).extend()   #将可迭代对象的元素逐个添加.insert()   #在指定位置插入lst = [1,2,3]lst.insert(len(lst),4)   #等同于append()
列表元素的删除
.remove()  #删除第一个匹配项,括号里的值在列表里需存在,否则就报错.pop()    #删除并返回指定索引的元素,不带参数则删除最后一个元素#del 语句del a[i]    #删除第i个元素del a[i:j]  #删除i到j-1的元素del a   #删除整个变量.clear()  #清空所有元素,成为空列表
列表方法
.index()  #查找元素索引,不存在则报错numbers.index(i,element)  #从索引i开始找element.count()  #统计元素出现的次数,不存在返回0.sort()   #原地排序numbers.sort()   #升序numbers.sort(reverse=True)   #降序#自定义排序.sort(key=len)    #按长度排序.sort(key=lambda x: x[-1])    #key用来指定排序依据,按最后一个字母排序#lambda x: x[-1]:这是一个匿名函数 x:代表列表里的每一个元素  x[-1]:代表每个元素的最后一个元素#反转列表.reverse()  
列表运算
#拼接(+1)#重复(*)#成员判断(in,not in)has_apple = 'apple' in fruits#比较运算:逐个比较
列表的遍历
#1.直接遍历for name in names:    print(name)#2.索引遍历for i in range(len(names)):    print(f"{i}:{names[i]}")#3.enumerate遍历(常用)for index, name in enumerate(names):    print(f"{idex}:{name}")#4.同时遍历多个列表for name,score in zip(names,scores):    print(f"{name}:{score}")#5.反向遍历for name in reversed(names):    print(name)#6.排序遍历for name in sorted(names):    print(name)
常用内置函数
len()   #列表长度max()    #最大值min()    #最小值sorted()   #排序any()   #至少一个True返回Trueall()   #全部True才返回Ture
深浅拷贝
copy.copy()     #浅拷贝:改外层不影响原对象,改内层会影响原对象copy.deepcopy()    #深拷贝:改什么都不影响原对象
深浅拷贝在列表中的应用,下期更新......

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  1. CONNECT:[ UseTime:0.001136s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001666s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000958s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000468s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000751s ]
  6. SELECT * FROM `set` [ RunTime:0.000223s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000590s ]
  8. SELECT * FROM `article` WHERE `id` = 491525 LIMIT 1 [ RunTime:0.000483s ]
  9. UPDATE `article` SET `lasttime` = 1783058556 WHERE `id` = 491525 [ RunTime:0.008534s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000295s ]
  11. SELECT * FROM `article` WHERE `id` < 491525 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000457s ]
  12. SELECT * FROM `article` WHERE `id` > 491525 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004218s ]
  13. SELECT * FROM `article` WHERE `id` < 491525 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000651s ]
  14. SELECT * FROM `article` WHERE `id` < 491525 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000886s ]
  15. SELECT * FROM `article` WHERE `id` < 491525 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000736s ]
0.094777s