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Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.  # Write a function named time_machine that takes an integer and a string of "minutes", "hours", "days", or "years".

Completely confused on this one? any help on how to solve?

time_machine.py
```import datetime
from datetime import timedelta

starter = datetime.datetime(2015, 10, 21, 16, 29)

def time_machine(1=minutes, 2=hours, 4=days, 1=years):
return time_machine(
# Remember, you can't set "years" on a timedelta!
# Consider a year to be 365 days.

## Example
# time_machine(5, "minutes") => datetime(2015, 10, 21, 16, 34)
``` MOD

Stepping through the challenge

```# Write a function named `time_machine` that takes an integer and a string..
def time_machine(num, string):
'''string is one of "minutes", "hours", "days", or "years".
num is multiple of this unit.
'''
# check for each string value and generate the appropriate timedelta
if string == 'minutes':
delta = datetime.timedelta(minutes=num)
if string == 'hours':
delta = datetime.timedelta(hours=num)
if string == 'days':
delta = datetime.timedelta(days=num)
if string == 'years':
num = num * 365
delta = datetime.timedelta(days=num)
# add this delta to 'starter' and return
return starter + delta
```

This can be compresses by building a dictionary of arguments for timedelta:

```# Write a function named `time_machine` that takes an integer and a string..
def time_machine(num, string):
'''string is one of "minutes", "hours", "days", or "years".
num is multiple of this unit.
'''
# adjust num if string is 'years'
if string == 'years':
num = num * 365
# change string to 'days'
string = 'days'
# build keyword args
kwargs = {string: num}
# create timedelta
delta = datetime.timedelta(**kwargs)
# add this delta to 'starter' and return
return starter + delta
```

Compressing further to get:

```import datetime

starter = datetime.datetime(2015, 10, 21, 16, 29)

def time_machine(value, units):
if units == "years":
value *= 365
units = "days"
return starter + datetime.timedelta(**{units: value})
```