擅长:python、mysql、java
<p>使用<a href="https://docs.python.org/3/library/argparse.html#choices" rel="nofollow noreferrer">^{<cd1>}</a>参数强制用户从一组受限制的值中进行选择。在</p>
<pre><code>import argparse
def Main():
parser = argparse.ArgumentParser()
parser.add_argument("input_directory",help = "The input directory where all of the files reside in")
parser.add_argument("file_type", help = "File Type", choices=['.txt', '.n12', '.csv'])
ns = parser.parse_args()
print(ns)
if __name__ == "__main__":
Main()
</code></pre>