In this article, the editor compiled for everyone about the function of eval in python and the example code, friends who need it, please refer to it.
The eval() function is used to execute a string expression and return the value of the expression.
Eval function function: evaluate the string str as a valid expression and return the calculation result. The eval function can realize the conversion between list, dict, tuple and str
The syntax of the eval() method:
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eval(expression[, globals[, locals
parameter:
expression - expression.
globals-variable scope, global namespace, if provided, it must be a dictionary object.
locals-variable scope, local namespace, if provided, can be any mapping object.
Example of use:
1. Convert a string to a list
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a = "[[1,2], [3,4], [5,6], [7,8], [9,0]]"
print(type(a))
b = eval(a)
print(type(b))
print(b)
2. Convert a string to a dictionary
a = "{1: 'a', 2: 'b'}"
print(type(a))
b = eval(a)
print(type(b))
print(b)
3. Convert strings into tuples
a = "([1,2], [3,4], [5,6], [7,8], (9,0))"
print(type(a))
b=eval(a)
print(type(b))
print(b）The above is the detailed content of the eval function in python, thank you for your study.
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