实验四

with open ('data1_1.txt','r',encoding='utf-8')as f:
    data = f.readline()

n=0
for line in data:
    if line.strip('\n')=='':
        continue
    n+=1
print(f'共{n}行')

with open ('data1_1.txt','r',encoding='utf-8')as f:
    n=0 
    for line in data:
        if line.strip('\n')=='':
            continue
        n+=1
print(f'共{n}行')

with open ('data1_2.txt','r',encoding='utf-8')as f:
    n=0
    for line in f:
        if line.strip('\n')=='':
            continue
        n+=1
print(f'共{n}行')

with open ('data1_2.txt','r',encoding='utf-8')as f:
    n=0
    for line in f:
        if line.isspace():
            continue
        n+=1
print(f'共{n}行')

with open ('data2.txt','r',encoding='utf-8')as f:
    data = f.read(),split('\n')
    
unique_line = []
for line in data:
    if data.count(line)==1:
        unique_line.append(line)
        
print(f'共｛len(unique_line)独特行｝')
for i in unique_line:
    print(i)

import csv
ls=[['城市','大致人口'],
    ['南京','850万'],
    ['纽约','2300万'],
    ['东京','3800万'],
    ['巴黎','1000万']]
with open('data.csv','w',enconding = 'utf-8',newline='') as f:
    writer = csv.writer(f)
    writer.writerow(ls)
with open('data4.csv','r',encoding = 'utf-8') as f:
    reader = csv.reader(f)
    for line in reader:
        print('\t'.join(line))

import csv
ls=[['城市','大致人口'],
    ['南京','850万'],
    ['纽约','2300万'],
    ['东京','3800万'],
    ['巴黎','1000万']]
with open('data.csv','w',enconding = 'utf-8',newline='') as f:
    writer = csv.writer(f)
    writer.writerow(ls)
with open('data4.csv','r',encoding = 'utf-8') as f:
    reader = csv.reader(f)
    for line in reader:
        print('\t'.join(line))

import  datetime
... t=datetime.datetime.now()
... t.strftime('%y%m%d')
... '20210509'
type(t.strftime('%y%m%d'))
<class 'str'>

 

 

 

 

with open('data6_1.txt','r',encoding='utf-8') as f:
    t=[]
    for line in f.readlines():
        m=line.strip().split()
        t.append(m)
t.sort(key=lambda l:l[2],reverse=True)

with open('data6_2.txt','w+',encoding='utf-8') as n:
        for i in t:
            n.write('  '.join(i)+'\n')

 

 

import random

def get_lucky_boy(lis:list,trys:int):
    result=[]
    for i in range(trys):
        boy=random.choice(lis)
        lis.remove(boy)
        result.append(boy)
    t=[]
    for i in result:
        t.append(' '.join(i)+'\n')
    return ''.join(t)
ls=[]
with open('data7.txt','r',encoding='utf-8') as f:
   for line in f.readlines():
       m=line.strip().split()
       ls.append(m)
n=int(input('yikutu desuka?'))
boys=get_lucky_boy(lis=ls,trys=n)
print(boys)
with open('lucky.txt','w',encoding='utf-8') as nf:
        nf.write(boys)

import datetime
import random

def get_lucky_boy(lis:list,trys:int):
    result=[]
    for i in range(trys):
        boy=random.choice(lis)
        lis.remove(boy)
        result.append(boy)
    return result

def ls2str(ls:list):
    t=[]
    for i in ls: 
        t.append(' '.join(i)+'\n')
    return ''.join(t)

ls=[]
with open('data7.txt','r',encoding='utf-8') as f:
    ls = []
    with open('data7.txt', 'r', encoding='utf-8') as f:
        for line in f.readlines():
            m = line.strip().split()
            ls.append(m)
    n=int(input('yikutudesuka?'))
    boys=get_lucky_boy(lis=ls,trys=n)
    result=ls2str(boys)
    print(result)
    filename=datetime.datetime.now().strftime('%Y%m%d')
    with open(filename,'w',encoding='utf-8') as nf:
        nf.write(result)