python基础方法

一、忽略大小写相等upper(),lower()

def cmp(str1,str2):
    return str1.upper()==str2.upper()

list1 = 'MAC'
list2 = 'mac'
print(cmp(list1,list2))

二、strip() 去掉前后空格

list1 = '    MAC        ','    ma c'
print([list.strip() for list in list1])

三、不确定要穿几个参数时

def PrintInfo(a,*b):
    print(a)
    for i in b:
        print(i)
PrintInfo(10)
PrintInfo(10,20,30)

四、行和列转换，（不一定正确）需要根据行、列数量来修改

matrix = [[1, 2, 3, 4],[5, 6, 7, 8],[9, 10, 11, 12]]
list = []
for i in range(len(matrix[1])):
    list.append([row[i] for row in  matrix])
print(list)

五、字典的遍历items()

knights = {'gallahad': 'the pure', 'robin': 'the brave'}
for k, v in knights.items():
    print(k, v)

六、遍历多个序列zip()

mx = [1, 2, 3, 4]
mt = [5, 6, 7, 8]
ma = [9, 10, 11, 12]
list = []
for i,j,n in zip(mx,mt,ma):
    list.append([i,j,n])
print(list)

更多内容后续遇到了再慢慢补全

七、random()的用法；

使用random()函数自动生成电话号码，生成一个0-99999999的数，自动不足8位

import random

list = '131'
print(list+str(random.randint(0,99999999)).zfill(8))

感觉这种方法不对，应该是每一位都是由0-9 random得出

import random
preftree = '132'
for i in range(8):
    a = str(random.randint(0,9))
    preftree += a
print(preftree)

 =========

import random

list = random.sample(range(10),8)　　#随机生成8位10以内的数
str1 = '132'
print([str1+str(i) for i in list])