Make sympy.abc more understandable

Generating symbols through the compiler is not understood by analysis tools,
so they will generate an error for every use of something imported from
sympy.abc.

sympy/abc.py

@@ -2,20 +2,36 @@
 
 import string
 
-from .core import Symbol
+from .core import Symbol, symbols
 from .core.alphabets import greeks
 from .core.compatibility import exec_
 
+a, b, c, d, e = symbols('a, b, c, d, e')
+f, g, h, i, j = symbols('f, g, h, i, j')
+k, l, m, n, o = symbols('k, l, m, n, o')
+p, q, r, s, t = symbols('p, q, r, s, t')
+u, v, w, x, y, z = symbols('u, v, w, x, y, z')
+
+A, B, C, D, E = symbols('A, B, C, D, E')
+F, G, H, I, J = symbols('F, G, H, I, J')
+K, L, M, N, O = symbols('K, L, M, N, O')
+P, Q, R, S, T = symbols('P, Q, R, S, T')
+U, V, W, X, Y, Z = symbols('U, V, W, X, Y, Z')
+
+alpha, beta, gamma, delta = symbols('alpha, beta, gamma, delta')
+epsilon, zeta, eta, theta = symbols('epsilon, zeta, eta, theta')
+iota, kappa, lamda, mu = symbols('iota, kappa, lamda, mu')
+nu, xi, omicron, pi = symbols('nu, xi, omicron, pi')
+rho, sigma, tau, upsilon = symbols('rho, sigma, tau, upsilon')
+phi, chi, psi, omega = symbols('phi, chi, psi, omega')
+
 _latin = list(string.ascii_letters)
 # COSINEQ should not be imported as they clash; gamma, pi and zeta clash, too
 _greek = list(greeks) # make a copy, so we can mutate it
 # Note: We import lamda since lambda is a reserved keyword in Python
 _greek.remove("lambda")
 _greek.append("lamda")
 
-for _s in _latin + _greek:
-    exec_("%s = Symbol('%s')" % (_s, _s))
-
 def clashing():
     """Return the clashing-symbols dictionaries.