[Tutor] Scientific Notation + 18 Digit Precision

[Hubert Fitch]

Thanks to all of you (Alan, Chris, Kent) for your responses!

Before I try to follow up on these suggestions, it might be good to examine the display function module, and provide a few lines from a .py module that needs display.

Typical lines in a defintion module, that need a formatted display : 
(All referenced symbols in this module are previously defined in another module)

# -------------------------------------------------------------------------------------------------------------------
#       VARIABLE  NAME,     DATA ,   ASSIGNMENT FORMULA,      COMMENT
# -------------------------------------------------------------------------------------------------------------------
#
#       INDUCTANCE
L0 = pi*mu0*r0    #  Classical Inductance
#       CAPACITANCE      
c0 = 4*pi*ep0*r0  # Classical Cpacitance

n = 2    # Quantum Number
#       RADIUS
r3 = (r0*(n/a)**2    ) # Bohr radius

#       ORBIT VELOCITY
v3 = Q0**2/(2*h*ep0*n) # Bohr Orbit Velocity
v = a*C/n  

#        Bohr Orbit Velocity
v3 = v                  #  Bohr Orbit Velocity
g3 = (1-v3**2/C**2)**-0.5 #  Gamma

#       FREQUENCY
f3  = g3*m0*v3**2/h  #  Bohr Orbit deBroglie frequency
---------------------------------------------------------------------------------------------


Most of the formatted results are already provided in the correct form. 
What should be changed in this display function module? 
-----------------------------------------------------------------------------------------------------------------
Display Function Module: 
(Written by Dr. Steve Spiklemire, Physics Dept Head Universtiy of indianapolis)
-----------------------------------------------------------------------------------------------------------------

def DisplayPyFile(fname, context=None):

    if context is None:
        context = globals()
    f = open(fname)
    lines = f.readlines()
    f.close()

    for line in lines:
        line = line.strip()
        if not line:
            continue
        leftAndRight = line.split('#',2)
        comment = ''
        if len(leftAndRight)>1:
            comment = leftAndRight[1]

        assignment = leftAndRight[0]
        leftAndRight = assignment.split('=')
        if len(leftAndRight) == 2:
            name = leftAndRight[0].strip()
            exec(assignment, context)
            if context.get(name,None) is not None:
                value = context.get(name,'???')
                print "%10s  =  %18.15e (%s)\t[%s]" % (name, value, assignment, comment)
            else:
                print "%s not defined. %s" % (name, assignment)
        else:
            print line
  -----------------------------------------------------------------------------------------------------------------------------

Hubert            

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