## Difference between defining multiple variable at a time and individually

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I am a newbie in Python and I'm trying to learn Python through self-learning. I was trying to build Fibonacci series using a `while` loop. Here is my code, which doesn't return the desired result. Could anyone explain the problem?

```a = 0
b = 1

while b<100:
print(b)
a = b
b = a + b
```

If we define `a, b` simultaneously like `a, b = b, a+b`, this works perfectly. Why is this happening? I don't understand because in both cases I am defining a and b the same way.

This is because programming languages like Python, and many others, execute the statements you write in the order you write them.

This means that by the time you execute `b = a + b`, the value of `a` has already changed in the previous line.

An easy way to solve this would be using a third variable to store the results temporarily.

```a = 0
b = 1
c = 1

while c < 100:
print(c)
c = a + b
a = b
b = c

```

Multiple Independent Variables – Research Methods in Psychology, Define factorial design, and use a factorial design table to represent and Distinguish between main effects and interactions, and recognize and give Researchers' inclusion of multiple independent variables in one experiment is The columns of the table represent cell phone use, and the rows represent time of day. The independent variable is the one the experimenter controls. The dependent variable is the variable that changes in response to the independent variable. The two variables may be related by cause and effect. If the independent variable changes, then the dependent variable is affected.

You are making one small mistake.

When you do `a = b`, you are changing the value of `a`. After this, when you do `b=a+b`, it is actually equivalent to `b = b+b` => `b=2b`.

To avoid this, use a temporary variable `temp` and storethe value of `a` in it. Then change the value of `a` using `a = b`. Then do, `a = a+b`.

Following is the code:

```a=0
b=1

while b<100:
print(b)

temp = a
a = b
b = temp+b
```

When you do `a, b = b, a+b`, the previous value of `a` is used for calculating the new `b`, we have don a similar thing above by storing the previous value of `a` in `temp`

DCL04-C. Do not declare more than one variable per , Declaring multiple variables in a single declaration can cause confusion regarding the types of the variables and their initial values. If more than one variable is� Defining a function means providing a function body; defining a class means giving all of the methods of the class and the fields. Once something is defined, that also counts as declaring it; so you can often both declare and define a function, class or variable at the same time. But you don't have to.

Operator "comma" (`,`) in Python is used to create a tuple, and it is allowed to omit the parentheses that surround a tuple. The expression `a, b = b, a+b` is actually an assignment of one tuple to another:

```(a, b) = (b, a + b)
```

This statement is executed by evaluating the tuple constructor on the right-hand side `(b, a + b)`. At this point, a new anonymous tuple (let's call it `c`) is created and the original values of `a` and `b` are not needed anymore. The tuple is then assigned elementwise to the tuple on the left-hand side. The new value of `a` becomes `c` (that is, former `b`) and the new value of `b` becomes `c` (that is, former `a+b`).

38. Do not declare more than one variable per declaration, The Java language allows a great deal of flexibility in the ways in which it is used, Declaring multiple variables in a single declaration could cause have been to invoke toString() on each individual element of the array c. export variable_name=value. The variable is available to any sub-process you run from that shell process. If you define a variable without export like below, variable_name=value. The variable is limited to the shell and it is not available to any other sub-process. You can use it for temporary and/or loop variables.

Your code is not working because you are changing the value of `a` before evaluating `b`. In the Fibonacci series, you want the previous value of a and b. You can use `list` as above or can introduce another variable to store values.

```while True:
temp = a + b
if temp >100:
break
print(temp)
a = b
b = temp
```

For reference, here is a simple implementation using `list`:

```lst = [0, 1]
while True:
temp = lst[-1]+lst[-2]
if temp>100:
break
lst.append(temp)

print(lst)
```

Multiple assignment in Python: Assign multiple values or the same , Assign multiple values to multiple variables Assign the same value to multiple If there is one variable on the left side, it is assigned as a tuple. If you want to process them separately, you need to assign them to each. To “declare” a variable (or other thing) in programming means that you are declaring your intention to create the thing, or declaring that it has been created in another file.

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