Any insight into the following will be greatly appreciated.  Many thanks.

from sympy import *

x = symbols('x', integer=True)

def main(fns, q0):
    for fn in fns:
        print(fn)
        print(fn.subs([x,q0]))
    
if __name__ == '__main__':
    f1=x
    f2=x+2
    main([f1,f2], 3)

yields

x
Traceback (most recent call last):
  File ".../Subs.py", line 13, in <module>
    main([f1,f2], 3)
  File ".../Subs.py", line 8, in main
    print(fn.subs([x,q0]))
  File "C:\Python34\lib\site-packages\sympy\core\basic.py", line 842, in 
subs
    o, n = sequence[i]
TypeError: 'Symbol' object is not iterable

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