# Python Binary

Given a base-10 integer, n, convert it to binary (base-2). Then find and print the base-10 integer denoting the maximum number of consecutive 1’s in n’s binary representation. - HackerRank

## Flow Chart

- Given n
- Turn n into binary
- Loop through n
- If n is 1, result++ (initialize result)
- else append to consecutive (initialize consecutive) and set result to 0

- append consecutive one last time after loop
- return max of consecutive

## Code

**Given n**

```
def con_ones(n):
"""Calculate the max number of consecutive 1's from binary."""
```

**Turn n into binary**

```
f'{n:b}'
```

**Loop through n**

```
def con_ones(n):
"""Calculate the max number of consecutive 1's from binary."""
for i in [int(j) for j in f'{n:b}']:
```

**If n is 1, result++ (declare result first)**

```
def con_ones(n):
"""Calculate the max number of consecutive 1's from binary."""
result = 0
for i in [int(j) for j in f'{n:b}']:
if i:
result = result + 1
```

**else append to consecutive (declare consecutive first) and set result to 0**

```
def con_ones(n):
"""Calculate the max number of consecutive 1's from binary."""
result = 0
consecutive = []
for i in [int(j) for j in f'{n:b}']:
if i:
result = result + 1
else:
consecutive.append(result)
result = 0
```

**append consecutive one last time after loop and return max of consecutive**

```
def con_ones(n):
"""Calculate the max number of consecutive 1's from binary."""
result = 0
consecutive = []
for i in [int(j) for j in f'{n:b}']:
if i:
result = result + 1
else:
consecutive.append(result)
result = 0
consecutive.append(result)
return max(consecutive)
```

## Solution

```
#!/bin/python3
import math
import os
import random
import re
import sys
def con_ones(n):
"""Calculate the max number of consecutive 1's from binary."""
result = 0
consecutive = []
for i in [int(j) for j in f'{n:b}']:
if i:
result = result + 1
else:
consecutive.append(result)
result = 0
consecutive.append(result)
return max(consecutive)
if __name__ == '__main__':
n = int(input())
print(con_ones(n))
```

# Conclusion

Got to learn how to turn a number into binary so that was cool. Also, trying out a flowchart (it was O.K.) and even wrote it down on the white board first (just for more of a warmup and because it was fun).