```python

import boto

def upload_file(file_name, bucket, object_name=None):

"""Upload a file to an S bucket

:param file_name: File to upload

:param bucket: Bucket to upload to

:param object_name: S object name. If not specified then file_name is used

:return: True if file was uploaded, else False

"""

# If S object_name was not specified, use file_name

if object_name is None:

object_name = file_name

# Create a new session and client for AWS services.

s = botoclient('s')

# Upload the file

try:

response = supload_file(file_name, bucket, object_name)

except FileNotFoundError:

print("The file was not found")

return False

except NoCredentialsError:

print("Credentials not available")

return False

return True

# Usage example:

upload_file('myfile.txt', 'mybucket')

```

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