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# fib5.py

# From Classic Computer Science Problems in Python Chapter 1

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

def fib5(n: int) -> int:

if n == 0: return n # special case

last: int = 0 # initially set to fib(0)

next: int = 1 # initially set to fib(1)

for _ in range(1, n):

last, next = next, last + next

return next

if __name__ == "__main__":

print(fib5(2))

print(fib5(50))