l=[]
for i in range(100):
  l.append('egg%s' %i)
print(l)
?
l=['egg%s' %i for i in range(100)]
l=['egg%s' %i for i in range(1000) if i > 10]
print(l)
          

            
names=['egon','alex_sb','wupeiqi','yuanhao','lxx']
res=map(lambda x:x.upper(),names)  # map函數(shù) 映射
names=list(res)         #['EGON', 'ALEX_SB', 'WUPEIQI', 'YUANHAO', 'LXX']
print(names)
names=['egon','alex_sb','wupeiqi','yuanhao','lxx']
names=[name.upper() for name in names]   #列表生成式
print(names)
names=['egon','alex_sb','wupeiqi','yuanhao','lxx'] #列表生成式
names=[len(name) for name in names if not name.endswith('sb')]
print(names)
nums=[]                 #一般循環(huán)方法
with open('a.txt','r',encoding='utf-8') as f:
  for line in f:
    nums.append(len(line))
print(max(nums))
with open('a.txt','r',encoding='utf-8') as f:#列表生成式
  nums=[len(line) for line in f]
  print(max(nums))  #28
with open('a.txt','r',encoding='utf-8') as f:
  nums=(len(line) for line in f) #生成器表達(dá)式
  print(next(nums))  #15
  print(next(nums))  #17
  print(next(nums))  #13
  print(max(nums))  #28
  print(max(nums))  #空列表
  max(len(line) for line in f)  #去掉括號(hào)
          

            
import spam
spam.read1()
          

            
import spam
強(qiáng)調(diào)：之后的導(dǎo)入會(huì)直接引用第一次導(dǎo)入的結(jié)果，不會(huì)重復(fù)執(zhí)行文件
import spam
print(spam)
模塊中功能的執(zhí)行始終以模塊自己的名稱空間為準(zhǔn)
read1=111111    #money=1000
spam.read1()    #def read1():
          #  print('spam模塊.read1：',money)
#結(jié)果：spam模塊.read1： 1000
          

            
import spam as sm
sm.read1()
engine=input('>>: ').strip()
if engine == 'mysql':
  import mysql as db
else engine == 'oracle':
  import oracle as db
db.parse()
          

            
from spam import money,read1,read2,change
read1()?
from spam import *   #從模塊中導(dǎo)入所有方法
read1()        #spam中：__all__=['money','read1'] 表示*能導(dǎo)入的方法，不寫(xiě)則表示能導(dǎo)入所有?
          

            
from spam import read1
money=1111111111
read1()   #結(jié)果：spam模塊.read1： 1000
from ... import ......名字，拿到的名字可以不加前綴直接使用，使用起來(lái)更加方便, 但問(wèn)題是容易與當(dāng)前執(zhí)行文件中相同的名字沖突
from spam import money
money=1111111111111111
print(money)    #1111111111111111,而不是1000
          

            
from spam import money as m
print(m)
          

            
#print(__name__)
__name__的值:
1、在文件被直接執(zhí)行的情況下，等于'__main__'
2、在文件被導(dǎo)入的情況下，等于模塊名
?
if __name__ == '__main__':
   print('文件被當(dāng)中腳本執(zhí)行啦。、。')
  read1()
else:
   print('文件被導(dǎo)入啦')
   read2()
          

            
import sys
sys.path.append(r'D:\code\SH_fullstack_s1\day14\dir1')
?
import m1
m1.f1()