https://github.com/xd-deng/common-questions-in-python

A collection of common questions about Python I encountered, and corresponding solutions
https://github.com/xd-deng/common-questions-in-python

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A collection of common questions about Python I encountered, and corresponding solutions

• Host: GitHub
• URL: https://github.com/xd-deng/common-questions-in-python
• Owner: XD-DENG
• Created: 2015-10-09T09:13:54.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2015-10-09T14:19:21.000Z (over 9 years ago)
• Last Synced: 2024-10-31T06:07:06.741Z (2 months ago)
• Size: 133 KB
• Stars: 3
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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## Common-Questions-in--Python

A collection of common questions about Python I encountered, and corresponding solutions

### 1. How to get the current time in Python?

```

>>> import datetime

>>> datetime.datetime.now()

datetime.datetime(2015, 10, 9, 17, 15, 30, 498779)

>>> test = datetime.datetime.now()

>>> test.date()

datetime.date(2015, 10, 9)

>>> test.time()

datetime.time(17, 15, 38, 72927)

```

### 2. How to get current directory and change the directory?

```

>>> import os

>>> os.getcwd()

'/Users/nus/Documents'

>>> os.chdir("/Users/nus")

>>> os.getcwd()

'/Users/nus'

```

### 3. How to get the current user name?

```

>>> import pwd

>>> import os

>>> pwd.getpwuid(os.getuid())

pwd.struct_passwd(pw_name='nus', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='NUS', pw_dir='/Users/nus', pw_shell='/bin/bash')

>>> pwd.getpwuid(os.getuid())[5]

'/Users/nus'

>>> pwd.getpwuid(os.getuid())[0]

'nus'

```

```

>>> from getpass import getuser

>>> getuser()

'nus'

```

### 4. How to get the path of the current script?

```

# Please note this only works for script, and does NOT work interactively.

import os

print os.path.realpath(__file__)

```

### 5. How to get the unique values (distinct values) in a list?

```

>>> test = [1,2,3,2,1,4,5,4]

>>> test

[1, 2, 3, 2, 1, 4, 5, 4]

>>> set(test)

set([1, 2, 3, 4, 5])

>>> list(set(test))

[1, 2, 3, 4, 5]

```

```

>>> test = ["a", "b", "a", "c"]

>>> list(set(test))

['a', 'c', 'b']

```