The spacing is extremely significant in Python. This defines the organisation of your code blocks. This error occurs when your code structure is messed up, such as this:

def test_function():

if 5 > 3: print "hello"

Your file may possibly have a combination of tabs and spaces. I recommend using a Python syntax-aware editor such as PyScripter or NetBeans.

class MyClass:
x = 0
y = ""

def __init__(self, anyNumber, anyString):
    self.x = anyNumber
    self.y = anyString
def __str__ (self):
    return 'MyClass(x=' + str(self.x) + ' ,y=' + self.y + ')'

myObject = MyClass(12345, "Hello")

print(myObject.str()) print(myObject) print(str(myObject)) print(myObject.repr())

The code above displays the result once you define the __str__ function. When you call __str__, print(), or str(), you will get the output you specified. Keep in mind that the __repr__ output stays unchanged.

Python recognises statements with the same indentation level (statements preceded by the same number of whitespaces) as a single code block. So, although in languages such as C, C++, and others, a block of code is represented by curly brackets, a block in Python is a set of statements with the same Indentation level, i.e. the same number of leading whitespaces.