将变量名作为命令行参数传递给print

Question

I was wondering if this is possible

a = 100
b = 200
c = 300

print(argv[1])

I want to print value of a when argv[1] = a , ie when I run program from command line as

python test.py a 

Output should be 100 .

And same for other the variables b and c . Is it something possible?

Answer 1

Yes, you can. I'm not sure you should, but you can, this way:

import sys

a = 100
b = 200
c = 300

print(globals()[sys.argv[1]])

Answer 2

You can use dictionaries to achieve this:

to_print = {
  "a": 100,
  "b": 200,
  "c": 300
}

print(to_print.get(argv[1]))

Answer 3

Use a dict :

d = {"a": 100, "b": 200, "c": 300}

print(d.get(argv[1]))

Answer 4

Use a dictionary:

values = {'a': 100, 'b': 200, 'c': 300}
print(values[argv[1]])

Answer 5

You can use below code:

import sys
values = {'a': 100, 'b': 200, 'c': 300}

if __name__ == "__main__":
    try:
        print(values[sys.argv[1]])
    except KeyError:
        print("Provide correct arguments")