实验4

Posted 2021-05-16 --艾合

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

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(\'data3.csv\', \'w\', encoding = \'utf-8\') as f:
  for line in ls:
    data = \',\'.join(line) + \'\\n\'
    f.write(data)
# 从data3.csv中读出数据，把逗号替换成\\t, 分行打印输出到屏幕上
with open(\'data3.csv\', \'r\', encoding = \'utf-8\') as f:
  data = f.read()
print(data.replace(\',\', \'\\t\'), end = \'\')

 

>>> 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:
    x = []
    data = f.readlines()
    for i in data:
        x.append(i.strip().split())
f = lambda x:x[2]
x.sort(key=f,reverse=True)
 
with open(\'data6_2.txt\',\'w\',encoding=\'utf-8\') as fn:
    for j in x:
        data1 = \' \' .join(j)
        data2 = \' \'.join(j) + \'\\n\'
        print(data1)
        fn.write(data2)

q = []
with open(\'data7.txt\', \'r\') as f:
    data = f.readlines()
    x = input(\'输入随机抽点人数：\')
    import random
    i = 0
    while i<int(x):
        y = random.choice(data)
        i = i+1
        q.append(y)
        print(y.strip())
 
with open(\'lucky.txt\',\'w\') as fn:
    for j in q:
        k = \'\'.join(j)
        fn.write(k)