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str.isdigit()

#!/usr/bin/python3

str = "123456"; 
print (str.isdigit())

str = "tutorialpro example....wow!!!"
print (str.isdigit())

True
False

# Check if a string is a number
def is_number(s):    
    try:    # If the float(s) statement can be executed, return True (string s is a float)        
        float(s)        
        return True    
    except ValueError:  # ValueError is a standard Python exception indicating an "invalid parameter"        
        pass  # If a ValueError exception is raised, do nothing (pass: do nothing, usually used as a placeholder statement)    
    try:        
        import unicodedata  # Package for handling ASCII codes        
        unicodedata.numeric(s)  # Function to convert a numeric string to a float        
        return True    
    except (TypeError, ValueError):        
        pass    
        return False

print(is_number(1))
print(is_number(1.0))
print(is_number(0))
print(is_number(-2))
print(is_number(-2.0))
print(is_number("abc"))

True
True
True
True
True
False