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You are given a string .
Your task is to verify that is a floating point number.

In this task, a valid float number must satisfy all of the following requirements:

Number can start with +, - or . symbol.
For example:
+4.50
-1.0
.5
-.7
+.4
-+4.5

Number must contain at least decimal value.
For example:
12.
12.0  

Number must have exactly one . symbol.
Number must not give any exceptions when converted using .