为PythonTeX文档设置随机种子

我是一名物理教师，我想用PythonTeX来写带有随机值的乳胶的问题

我想在文档上运行pythontex3.py并获得一组新的随机值。据我所知，python随机模块将从系统时钟中选择一个种子，这样在启动python时就不会总是得到相同的随机数集

然而，pythontex3.py似乎总是以相同的种子开始，因此每次都生成相同的伪随机数集

这是一个MWE

    \documentclass{exam}
    \usepackage{pythontex}

    \begin{document}
    \begin{pycode}
    import random
    # Create large number with 3 significant digits
    Number=random.randint(100,1000)*1000
    \end{pycode}
    
    \begin{questions}
    \question
    The number \pyc{print(Number)} in scientific notation is
    \begin{choices}
        \CorrectChoice \pyc{print('%.2E' % Number)}
        \choice \pyc{print('%.2E' % (Number*1*10**random.randint(-10,-5)))}
        \choice \pyc{print('%.2E' % (Number*1*10**random.randint(-5,0)))}
        \choice \pyc{print('%.2E' % (Number*1*10**random.randint(5,10)))}
    \end{choices}
    \end{questions}
    \end{document}

这将在我的机器上生成以下内容。

---

为什么不在代码中明确提供随机种子

random.seed() # use system time as a randomness source

或者，您可以使用

random.seed(2345)

---

为什么不在代码中显式提供随机种子

random.seed() # use system time as a randomness source

或者，您可以使用

random.seed(2345)

---

解决方案是用系统的时间设置随机种子，然后告诉python始终运行python代码。默认情况下，只有在python代码自上次编译以来发生更改时，pythontex才会更新

\documentclass{exam}
\usepackage{pythontex}

\begin{document}
\begin{pycode}
import random
# Set seed by clock's microsecond so that each 
# compilation will give new random values
from datetime import datetime
now=datetime.now()
# Manually set seed if reproducible sequence is desired
random.seed(now.microsecond)
# Create large number with 3 significant digits
Number=random.randint(100,1000)*1000
\end{pycode}
\begin{questions}
\question
The number \pyc{print(Number)} in scientific notation is
\begin{choices}
    \CorrectChoice \pyc{print('%.2E' % Number)}
    \choice \pyc{print('%.2E' % (Number*1*10**random.randint(-10,-5)))}
    \choice \pyc{print('%.2E' % (Number*1*10**random.randint(-5,0)))}
    \choice \pyc{print('%.2E' % (Number*1*10**random.randint(5,10)))}
\end{choices}
\end{questions}
\end{document}

然后用

pdflatex MWE.tex；pythontex3-runall=true MWE.tex；pdflatex MWE.tex

---

解决方案是用系统的时间设置随机种子，然后告诉python始终运行python代码。默认情况下，只有在python代码自上次编译以来发生更改时，pythontex才会更新

\documentclass{exam}
\usepackage{pythontex}

\begin{document}
\begin{pycode}
import random
# Set seed by clock's microsecond so that each 
# compilation will give new random values
from datetime import datetime
now=datetime.now()
# Manually set seed if reproducible sequence is desired
random.seed(now.microsecond)
# Create large number with 3 significant digits
Number=random.randint(100,1000)*1000
\end{pycode}
\begin{questions}
\question
The number \pyc{print(Number)} in scientific notation is
\begin{choices}
    \CorrectChoice \pyc{print('%.2E' % Number)}
    \choice \pyc{print('%.2E' % (Number*1*10**random.randint(-10,-5)))}
    \choice \pyc{print('%.2E' % (Number*1*10**random.randint(-5,0)))}
    \choice \pyc{print('%.2E' % (Number*1*10**random.randint(5,10)))}
\end{choices}
\end{questions}
\end{document}

然后用

pdflatex MWE.tex；pythontex3-runall=true MWE.tex；pdflatex MWE.tex

---

手动设置种子是一个好主意，我现在将使用它。我尝试使用x=datetime.now random.seedx.microsecond在每次编译时获取不同的种子，但没有成功。手动设置种子是一个好主意，我现在将使用它。每次编译时，我都尝试使用x=datetime.now random.seedx.microsecond来获得不同的种子，但没有成功。