python eval set variable
exec('x=1')python eval function
# eval(expression, [globals[, locals]]
x = 100
y = 200 # x and y are global vars
eval('6 * 7')
# output : 42
eval('x + y')
#output : 300
# we can override global vars x and y as follows
eval('x + y',{'x':50,'y':25})
#output: 75 and not 300
'''eval accepts the following expression examples:
literals : 6 and 7 from above are literals also lists, floats, boolean,strings
names : my_num = 3 # the my_num is the name :NOTE that assignments are not allowed in eval
attributes: funtion_name.attribute
operations: * from above is an operator
functions: must return a value eval( sum( [8,16,32] ) ) gives: 56, fibonacci(3)
'''eval in python
from math import *
names = {'square_root': sqrt, 'power': pow}
print(eval('dir()', names))
# Using square_root in Expression
print(eval('square_root(9)', names))eval in python
expr="(2+(3*2))/2"
print(eval(expr))eval in python
num=10
expr="(2+(3*2))/2 + num"
print(eval(expr))Copyright © 2021 Codeinu
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