Python笔记：常用的标准库

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Python 中常用的标准库

python中获取当前时间和日期的模块： datetime
python中具有更改当前工作目录的方法 os
哪个模块可以将逗号分隔 (.csv) 文件中的每行数据读取到 Python 中？ csv
哪个模块可以帮助我们从 zip 文件中提取所有文件？ zipfile
哪个模块可以显示代码的运行时间？ time

Python 中常用的标准库[相关练习]

使用 math 模块，计算 e 的3次幂，然后输出答案
```
import math
print(math.exp(3)) # 20.085536923187668
```

写一个叫做 generate_password 的函数，该函数会从提供的单词文件中随机选择三个单词，并将它们连接成一个字符串。我们已经在起始代码中提供了从文件中读取数据的代码，你需要利用这些部分构建一个密码。

words.txt:

Alice
was
beginning
to
get
very
tired
of
sitting
by
her
sister
bank
having
nothing
Once
twice
she
had
peeped
into
the
book
her
sister
was
reading
but
it
had
no
pictures
or
conversations
in
it
and
what
is
the
use
of
a
book
thought
Alice
without
pictures
or
conversations

password_generator.py ：


# Use an import statement at the top

import random
word_file = "words.txt"
word_list = []


#fill up the word_list

with open(word_file,'r') as words:
  for line in words:
    # remove white space and make everything lowercase
    word = line.strip().lower()
    # don't include words that are too long or too short
    if 3 < len(word) < 8:
      word_list.append(word)


# Add your function generate_password here


# It should return a string consisting of three random words 


# concatenated together without spaces

def generate_password() :
    return random.choice(word_list) + random.choice(word_list) + random.choice(word_list)


# test your function

print(generate_password())

运行 $ python password_generator.py, 随机输出三个单词连成的字符串

Python笔记：常用的标准库

Python 中常用的标准库

Python 中常用的标准库[相关练习]

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