Uploading and downloading objects in AWS - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to upload a file to an S3 bucket using AWS CLI.

AWS

aws s3 cp myfile.txt s3://[1]/

Drag options to blanks, or click blank then click option'

Amybucket

Bmyfile.txt

Cfolder

Dbucketname

Attempts:

3 left

💡 Hint

Common Mistakes

Using the file name instead of the bucket name

Using a folder name without the bucket

The command uploads myfile.txt to the S3 bucket named mybucket.

2fill in blank

medium

Complete the code to download a file named report.pdf from an S3 bucket.

AWS

aws s3 cp s3://mybucket/[1] ./

Drag options to blanks, or click blank then click option'

Adata.csv

Bimage.png

Creport.pdf

Ddocument.docx

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong file name

Missing the file name after the bucket

The command downloads the file report.pdf from the bucket mybucket to the current folder.

3fill in blank

hard

Fix the error in the code to upload a file to S3 using the AWS SDK for Python (boto3).

AWS

s3_client.upload_file('data.csv', [1], 'data.csv')

Drag options to blanks, or click blank then click option'

A'mybucket'

Bmybucket

C'data.csv'

D'bucketname'

Attempts:

3 left

💡 Hint

Common Mistakes

Passing bucket name without quotes

Passing file name instead of bucket name

The bucket name must be a string in quotes. Using 'mybucket' is correct.

4fill in blank

hard

Fill both blanks to download an object from S3 using boto3 and save it locally.

AWS

s3_client.[1](Bucket='mybucket', Key='image.png', Filename=[2])

Drag options to blanks, or click blank then click option'

Adownload_file

B'image.png'

C'local_image.png'

Dupload_file

Attempts:

3 left

💡 Hint

Common Mistakes

Using upload_file instead of download_file

Saving with the same key name without quotes

The method download_file downloads the object. The local filename to save is 'local_image.png'.

5fill in blank

hard

Fill all three blanks to upload a file to S3 with public read access using boto3.

AWS

s3_client.[1](Filename=[2], Bucket=[3], Key='public_file.txt', ExtraArgs={'ACL': 'public-read'})

Drag options to blanks, or click blank then click option'

Aupload_file

B'myfile.txt'

C'mybucket'

Ddownload_file

Attempts:

3 left

💡 Hint

Common Mistakes

Using download_file instead of upload_file

Passing variables without quotes

Missing ExtraArgs for ACL

The upload_file method uploads the file. The filename and bucket name must be strings with quotes.

Practice

1. What does uploading an object to an AWS S3 bucket mean?

easy

A. Deleting a file from the cloud storage

B. Saving a file from your computer to the cloud storage

C. Copying a file from one folder to another on your computer

D. Viewing a file stored in the cloud without downloading

Solution

1. Step 1: Understand uploading concept

   Uploading means moving or saving a file from your local device to a remote place, like cloud storage.

2. Step 2: Apply to AWS S3 context

   In AWS S3, uploading an object means saving your local file into an S3 bucket in the cloud.

3. Final Answer:

   Saving a file from your computer to the cloud storage -> Option B

4. Quick Check:

   Uploading = Save local file to cloud [OK]

Hint: Uploading means sending files from your PC to cloud storage [OK]

Common Mistakes:

• Confusing uploading with downloading
• Thinking uploading deletes files
• Mixing local file moves with cloud uploads

2. Which AWS CLI command correctly uploads a file named photo.jpg to a bucket called mybucket?

easy

A. aws s3 get photo.jpg s3://mybucket/

B. aws s3 download photo.jpg s3://mybucket/

C. aws s3 cp photo.jpg s3://mybucket/

D. aws s3 remove photo.jpg s3://mybucket/

Solution

1. Step 1: Identify correct AWS CLI upload command

   The command to upload files to S3 is aws s3 cp followed by the local file and the bucket path.

2. Step 2: Match command with given file and bucket

   Using aws s3 cp photo.jpg s3://mybucket/ uploads the file photo.jpg to the bucket mybucket.

3. Final Answer:

   aws s3 cp photo.jpg s3://mybucket/ -> Option C

4. Quick Check:

   Upload command = aws s3 cp [OK]

Hint: Use 'aws s3 cp' to copy files to S3 bucket [OK]

Common Mistakes:

• Using 'download' instead of 'cp' for upload
• Confusing 'get' with upload command
• Using 'remove' which deletes files

3. What will be the result of this AWS CLI command?
aws s3 cp s3://mybucket/report.pdf ./

medium

A. Downloads report.pdf from the bucket to current folder

B. Uploads report.pdf from local to the bucket

C. Deletes report.pdf from the bucket

D. Lists all files in the bucket

Solution

1. Step 1: Understand the command structure

   The command aws s3 cp copies files. The source is s3://mybucket/report.pdf and destination is ./ (current folder).

2. Step 2: Determine direction of copy

   Since source is S3 and destination is local, the file is downloaded from the bucket to the local folder.

3. Final Answer:

   Downloads report.pdf from the bucket to current folder -> Option A

4. Quick Check:

   Source S3 to local = download [OK]

Hint: Source path starting with s3:// means download to local [OK]

Common Mistakes:

• Thinking 'cp' always uploads
• Confusing source and destination order
• Assuming it deletes files

4. You run this command to download a file but get an error:
aws s3 cp s3://mybucket/data.csv ./
What is the most likely cause?

medium

A. You forgot to add --recursive flag

B. You used the wrong command; should be aws s3 upload

C. The local folder ./ does not exist

D. The file data.csv does not exist in the bucket

Solution

1. Step 1: Analyze the error context

   The command is correct for downloading a single file. An error usually means the file is missing or inaccessible.

2. Step 2: Check common causes

   If the file data.csv is not in the bucket, the command fails. The local folder ./ always exists as current directory, and --recursive is not needed for single files.

3. Final Answer:

   The file data.csv does not exist in the bucket -> Option D

4. Quick Check:

   Missing file in bucket causes download error [OK]

Hint: Check if file exists in bucket before downloading [OK]

Common Mistakes:

• Using wrong command for download
• Assuming local folder missing causes error
• Adding unnecessary flags

5. You want to upload all files from your local folder photos/ to the S3 bucket mybucket preserving folder structure. Which command should you use?

hard

A. aws s3 sync photos/ s3://mybucket/

B. aws s3 cp photos/ s3://mybucket/

C. aws s3 cp photos/ s3://mybucket/ --no-recursive

D. aws s3 mv photos/ s3://mybucket/ --recursive

Solution

1. Step 1: Understand folder upload options

   To upload multiple files preserving folder structure, aws s3 sync is preferred as it copies all files and folders efficiently.

2. Step 2: Compare commands

   aws s3 cp --recursive can copy folders but sync is better for syncing changes and preserving structure. mv moves files (deletes local), which may not be desired.

3. Final Answer:

   aws s3 sync photos/ s3://mybucket/ -> Option A

4. Quick Check:

   Use 'sync' to upload folders preserving structure [OK]

Hint: Use 'aws s3 sync' for folder uploads preserving structure [OK]

Common Mistakes:

• Using 'cp' without --recursive for folders
• Using 'mv' which deletes local files
• Forgetting to preserve folder structure