# 複習
2022 資訊之芽 北區py班
yjrubixcube
---
---
# 2022/03/06
----
## print
```python=
print("hello world")
print("Bing", "Chilling", sep="~~~", end="!")
```
----
## variables
```python=
name = "Rick"
age = 56
a, b = 1, 10
a, b = b, a
```
----
## input
```python=
i = input("input something: ") # str
```
`input`一次就是讀一整行
`input`一次就是讀一整行
`input`一次就是讀一整行
因為還是會有人搞錯所以講三次
----
## ~~ntr~~ str
```python=
print("1" + "2")
print("a" * 10)
print('Hello, it\'s me.')
print("a\tb\nc")
print(f"name: {name}, age: {age}")
```
----
## operator
```python=
print(2 + 3)
print(2 - 3)
print(2 * 3)
print(2 / 3)
print(2 // 3)
print(2 % 3)
print(2 ** 3)
i = 100
i += 1
i -= 1
i *= 3
i /= 4
i //= 4
i %= 4
i **= 2
```
----
## 轉型
```python=
print(int(True))
print(float(1))
print(str(123))
```
---
# 2022/03/13
----
## comparison operators
- \>
- <
- ==
- \>=
- <=
- !=
----
## logic operators
- and
- or
- not
----
## if elif else
```python=
if a>b:
print("case 1")
elif a>c:
print("case 2")
else:
print("case 3")
```
記得縮排(tab or 4空白)
----
## nested if
```python=
if a>b:
if b>c:
if c>d:
print("pls don't do this")
if a>b and b>c and c>d:
print("better")
```
----
## 酷酷的東西
```python=
condition = False
a = 1 if condition else -1
```
----
## while
```python=
b = int(input())
i = 1
while i<100:
if i == b: break
print(i)
i += 1
else:
print("done")
```
----
## while 之會跳舞的乘法表
```python=
i, j = 1, 1
while i<10:
if i == 5:
i += 1
continue
while j<10:
if j == 5:
j += 1
continue
print(f"{i} * {j} = {i*j}", end="\t")
j += 1
print()
i += 1
```
---
# 2022/03/20
----
## range(start, end, step)
```python=
range(10)
range(5, 10)
range(10, 1, -1)
```
----
## for 之會跳舞的程式
```python=
for i in range(10):
if i == 5: continue
print(i)
```
----
## for
```python=
b = int(input())
for i in range(10):
if i == b: break
print(i)
else:
print("done")
```
----
## list +
```python=
l = []
l.append(1)
l.extend([4, 5, 6])
l.insert(2, 10)
```
----
## list -
```python=
l = list(range(10))
l.pop(3)
l.remove(3)
l.clear()
```
----
## list method
```python=
l = list(range(10))
l.count(1)
l.index(7)
l.sort()
l.reverse()
c = l.copy()
```
----
## list function
```python=
min(l), max(l), sum(l)
sorted(l)
map(int, l)
```
map回傳的是map object,要把他當list用的話要轉型
---
# 2022/03/27
----
## 更多string
```python=
s = 'abcdefg'
print(s[2:5])
print(s[-1])
print("gg" in s)
r = s.replace("abc", "zzz")
print(r)
```
----
## string比大小
```python=
print("abc" < "abd")
print("abc" < "abcd")
print("abc" != "def")
```
----
## string method
```python=
"ABCD1234".isdigit()
"ABCD1234".isalpha()
"ABCD1234".isalnum()
s = ' aaabbcDEFG '
print(s.strip())
print(s.upper())
print(s.lower())
print(s.find("aa"))
i = '1 2 3 4 5'
print(i.split())
l = ['1', '2', '3', '4', '5']
print("".join(l))
```
----
## dictionary
```python=
d = {"shaochun": 100, "rick": 99}
print(d["shaochun"])
d["new_person"] = 87
print(d.get("nobody"))
d.pop("new_person")
d.clear()
```
key 只能放immutable, 沒有排序
----
## dictionary for
```python=
for k in d.keys():
do something
for v in d.values():
do something
for k, v in d.items():
do something
```
---
# 2022/04/10
----
## function
```python=
def func(a, b):
global z
a += 1
b = 3
z = 100
return a * b
x, y, z = 7, 8, 9
print(x, y, z)
print(func(x, y))
print(x, y, z)
```
----
## function 之[recursion](https://hackmd.io/@VLvbo_-_QjqwJnUcuKdxSQ/r1LyyItEq#/6/2)
```python=
def fact(n):
if n == 0: return 1
return n * fact(n - 1)
```
---
# 2022/04/17
----
## module
```python=
import math
import numpy as np
from math import gcd
from math import gcd as ggccXDDDD
```
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