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1. pydata-book
2. ch02.ipynb

In [1]:

import numpy as np
np.random.seed(12345)
np.set_printoptions(precision=4, suppress=True)

In [2]:

import numpy as np
data = [np.random.standard_normal() for i in range(7)]
data

In [6]:

def append_element(some_list, element):
    some_list.append(element)

In [7]:

data = [1, 2, 3]
append_element(data, 4)
data

In [8]:

a = 5
type(a)
a = "foo"
type(a)

In [10]:

a = 4.5
b = 2
# String formatting, to be visited later
print(f"a is {type(a)}, b is {type(b)}")
a / b

In [12]:

a = 5; b = 4.5
isinstance(a, (int, float))
isinstance(b, (int, float))

In [15]:

def isiterable(obj):
    try:
        iter(obj)
        return True
    except TypeError: # not iterable
        return False

In [16]:

isiterable("a string")
isiterable([1, 2, 3])
isiterable(5)

In [18]:

a = [1, 2, 3]
b = a
c = list(a)
a is b
a is not c

In [21]:

a_list = ["foo", 2, [4, 5]]
a_list[2] = (3, 4)
a_list

In [22]:

a_tuple = (3, 5, (4, 5))
a_tuple[1] = "four"

In [23]:

ival = 17239871
ival ** 6

In [24]:

fval = 7.243
fval2 = 6.78e-5

In [27]:

c = """
This is a longer string that
spans multiple lines
"""

In [29]:

a = "this is a string"
a[10] = "f"

In [30]:

b = a.replace("string", "longer string")
b

In [32]:

a = 5.6
s = str(a)
print(s)

In [33]:

s = "python"
list(s)
s[:3]

In [35]:

s = r"this\has\no\special\characters"
s

In [36]:

a = "this is the first half "
b = "and this is the second half"
a + b

In [37]:

template = "{0:.2f} {1:s} are worth US${2:d}"

In [38]:

template.format(88.46, "Argentine Pesos", 1)

In [39]:

amount = 10
rate = 88.46
currency = "Pesos"
result = f"{amount} {currency} is worth US${amount / rate}"

In [40]:

f"{amount} {currency} is worth US${amount / rate:.2f}"

In [42]:

val_utf8 = val.encode("utf-8")
val_utf8
type(val_utf8)

In [44]:

val.encode("latin1")
val.encode("utf-16")
val.encode("utf-16le")

In [45]:

True and True
False or True

In [47]:

a = True
b = False
not a
not b

In [48]:

s = "3.14159"
fval = float(s)
type(fval)
int(fval)
bool(fval)
bool(0)

In [49]:

a = None
a is None
b = 5
b is not None

In [50]:

from datetime import datetime, date, time
dt = datetime(2011, 10, 29, 20, 30, 21)
dt.day
dt.minute

In [52]:

dt.strftime("%Y-%m-%d %H:%M")

In [53]:

datetime.strptime("20091031", "%Y%m%d")

In [54]:

dt_hour = dt.replace(minute=0, second=0)
dt_hour

In [56]:

dt2 = datetime(2011, 11, 15, 22, 30)
delta = dt2 - dt
delta
type(delta)

In [58]:

a = 5; b = 7
c = 8; d = 4
if a < b or c > d:
    print("Made it")

In [60]:

for i in range(4):
    for j in range(4):
        if j > i:
            break
        print((i, j))

In [61]:

range(10)
list(range(10))

In [62]:

list(range(0, 20, 2))
list(range(5, 0, -1))

In [63]:

seq = [1, 2, 3, 4]
for i in range(len(seq)):
    print(f"element {i}: {seq[i]}")

In [64]:

total = 0
for i in range(100_000):
    # % is the modulo operator
    if i % 3 == 0 or i % 5 == 0:
        total += i
print(total)

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