import numpy as np
from pandas import DataFrame

inp1 = [{'a':1, 'b':2, 'c':0}, {'a':1,'b':3,'c':0}, {'a':0,'b':3,'c':0}]
df1 = DataFrame(inp1)

inp2 = [{'d':2, 'e':0}, {'d':0,'e':3}, {'d':0,'e':4}]
df2 = DataFrame(inp2)

threshold = 1

df1.loc[np.sqrt((df1.a - df2.d) ** 2 + (df1.b - df2.e) ** 2) >   threshold, 'c'] = "yes"

print(df1)
print(df2)

   a  b    c
0  1  2  yes
1  1  3    0
2  0  3    0

   d  e
0  2  0
1  0  3
2  0  4