## why the def function does not calculate the same answer with my last print row?

which of the following enclose the input parameters or arguments of a function?
python function return multiple values
if return statement is not used inside the function the function will return
how to use return value in another function python
python function return list
python function return variable
how to print the result of a function in python
python function always returns a value true or false

Just want to know why the last two commands have different returns The return should come out with the value 600 rather than 100 for the exchange function.

```unit ={"HKD":1, "USD":7.8, "CAN":6}
price = 100

for cur, rate in unit.items():
print (cur, rate)

def exchange(price, cur):
for (cur, rate) in unit.items():
if cur=="HKD":
exp = unit["HKD"]*price
elif cur=="USD":
exp = unit["USD"]*price
else:
exp = unit["CAN"]*price
return print(exp)

exchange(100, "CAN")
print(unit["CAN"]*price)
```

just use the dictionary properly:

```def exchange(price, cur):
return unit[cur]*price
```

Why your code doesn't work? Beside the inefficient aspect, you're shadowing your `cur` parameter when loopîng on the dictionary keys.

Always ask yourself "why am I looping on a dictionary to perform a lookup when a dictionary is made for lookup without loops"

Some Tips, Tricks, and Common Errors — How to Think Like a , (Built-in functions are not privileged like keywords: we can define our own variable or Quiz: Is the function f(z) = 3z + 5 the same as function f above? So line 6 should not be there, and line 7 has to be outside the loop. because Python reached the last statement), the stack frame and its local variables are all destroyed. To print the spreadsheet down to the last row in column E which has any cell content. Except that I need code to determine which of columns D or E is the last one that has any content and then use that row as the last row to print down to. Note that this code does not print any columns which may be hidden which is what I want it to do.

Update your function, it should just return the exp rather then print

```def exchange(price, cur):
for (cur, rate) in unit.items():
if cur == "HKD":
exp = unit["HKD"] * price
elif cur == "USD":
exp = unit["USD"] * price
else:
exp = unit["CAN"] * price
return exp
```

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You're using the same name cur as a function parameter as well as the iterator. Hence the parameter passed into the function is no longer the value of the variable cur.

In the first iteration of the loop the value of cur becomes "HKD" which causes the first if statement to be correct. It will calculate *exp = unit["HKD"]price which is equal to 100.

Also, in your code the return statement is inside the for loop and hence in the first iteration itself the looping stops and the value of exp is 100 when it is printed.

This problem can be rectified as follows:

```unit ={"HKD":1, "USD":7.8, "CAN":6}
price = 100

for cur, rate in unit.items():
print (cur, rate)

def exchange(price, curr):
for (cur, rate) in unit.items():
if curr=="HKD":
exp = unit["HKD"]*price
elif curr=="USD":
exp = unit["USD"]*price
else:
exp = unit["CAN"]*price
return print(exp)

exchange(100, "CAN")
print(unit["CAN"]*price)
```

6.2. Functions that Return Values — How to Think like a Computer , Most functions require arguments, values that control how the function does its job. want to find the absolute value of a number, you have to indicate what the number is. In the last example, 503 is returned, since it is larger than 33, 125, and 1. The answer is that function definition is not the same as function execution. Create a function to calculate the different w.r.t. value the year before at the same day and month. This function would be invoked on each row of data frame. def calChange(row): change = 0 val_prev_yr = df_dateInx.loc[row.Date - 1]['min'] val_this_row = row['min'] # do anything with values and return change return change

You are defining "cur" variable again in for loop in your function. In another sense, you have defined cur="can" while starting function, when python enter the function you have over-write cur variable as defining it again in for loop.

I guess it will work!

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Python: user defined function, Python: user defined function: In all programming and scripting language, In Python concept of function is same as in other languages. functions. Last update on February 28 2020 12:16:39 (UTC/GMT +8 hours) Line 2 : Calculate and return the value of (x + y)2 For second print statement [ Line no 4] My vlookup is only working for the top half of my spreadsheet and then stops working on any cell past row 270. My vlookup table is a named range, first column in order by dates, returning column is to the left of the reference column and formatting matches and is not text.

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• you don't want to do `return print(exp)` you want to do `return exp`
• In `exchange` you use `cur` for both the input parameter and for iterating over the keys of your dict in the for-loop. Change one of them to something else.