display bug while using pretty_print with sympy.vector object in the terminal · sympy/sympy challenge

Problem statement

The following code jumbles some of the outputs in the terminal, essentially by inserting the unit vector in the middle -

python

from sympy import *
from sympy.vector import CoordSys3D, Del

init_printing()

delop = Del()
CC_ = CoordSys3D("C")
x,    y,    z    = CC_.x, CC_.y, CC_.z
xhat, yhat, zhat = CC_.i, CC_.j, CC_.k

t = symbols("t")
ten = symbols("10", positive=True)
eps, mu = 4*pi*ten**(-11), ten**(-5)

Bx = 2 * ten**(-4) * cos(ten**5 * t) * sin(ten**(-3) * y)
vecB = Bx * xhat
vecE = (1/eps) * Integral(delop.cross(vecB/mu).doit(), t)

pprint(vecB)
print()
pprint(vecE)
print()
pprint(vecE.doit())

Output:

python

⎛     ⎛y_C⎞    ⎛  5  ⎞⎞    
⎜2⋅sin⎜───⎟ i_C⋅cos⎝10 ⋅t⎠⎟
⎜     ⎜  3⎟           ⎟    
⎜     ⎝10 ⎠           ⎟    
⎜─────────────────────⎟    
⎜           4         ⎟    
⎝         10          ⎠    

⎛     ⌠                           ⎞    
⎜     ⎮       ⎛y_C⎞    ⎛  5  ⎞    ⎟ k_C
⎜     ⎮ -2⋅cos⎜───⎟⋅cos⎝10 ⋅t⎠    ⎟    
⎜     ⎮       ⎜  3⎟               ⎟    
⎜  11 ⎮       ⎝10 ⎠               ⎟    
⎜10  ⋅⎮ ─────────────────────── dt⎟    
⎜     ⎮             2             ⎟    
⎜     ⎮           10              ⎟    
⎜     ⌡                           ⎟    
⎜─────────────────────────────────⎟    
⎝               4⋅π               ⎠    

⎛   4    ⎛  5  ⎞    ⎛y_C⎞ ⎞    
⎜-10 ⋅sin⎝10 ⋅t⎠⋅cos⎜───⎟ k_C ⎟
⎜                   ⎜  3⎟ ⎟    
⎜                   ⎝10 ⎠ ⎟    
⎜─────────────────────────⎟    
⎝           2⋅π           ⎠    ```

The environment starts at commit fa9b4b140ec0 (sympy/sympy 1.11), dependencies installed and tests runnable from the first minute. You are graded by hidden tests taken from the fix that was actually merged upstream.