# ZHANG Yixin 15210130100

## Homework1

``````

In [2]:

import random, datetime
import numpy as np
import pylab as plt
import statsmodels.api as sm
from scipy.stats import norm
from scipy.stats.stats import pearsonr

``````
``````

In [3]:

str(3)

``````
``````

Out[3]:

'3'

``````
``````

In [4]:

int('5')

``````
``````

Out[4]:

5

``````
``````

In [5]:

float('7.1')

``````
``````

Out[5]:

7.1

``````
``````

In [6]:

range(10)

``````
``````

Out[6]:

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

``````
``````

In [7]:

range(1,10)

``````
``````

Out[7]:

[1, 2, 3, 4, 5, 6, 7, 8, 9]

``````
``````

In [8]:

dir

``````
``````

Out[8]:

<function dir>

``````
``````

In [9]:

dir(str)[-5:]

``````
``````

Out[9]:

['swapcase', 'title', 'translate', 'upper', 'zfill']

``````
``````

In [10]:

x='Hello WorlD'
dir(x)[-10:]

``````
``````

Out[10]:

['rstrip',
'split',
'splitlines',
'startswith',
'strip',
'swapcase',
'title',
'translate',
'upper',
'zfill']

``````
``````

In [11]:

x.lower()

``````
``````

Out[11]:

'hello world'

``````
``````

In [12]:

x.upper()

``````
``````

Out[12]:

'HELLO WORLD'

``````
``````

In [13]:

x.rstrip()

``````
``````

Out[13]:

'Hello WorlD'

``````
``````

In [14]:

x.strip()

``````
``````

Out[14]:

'Hello WorlD'

``````
``````

In [16]:

x='hello world'
type(x)

``````
``````

Out[16]:

str

``````
``````

In [ ]:

``````