Day 1
- python shortcomings
- Slightly lower efficiency and therefore computationally intensive tasks can be written in C / C ++.
- Too many in the development framework that can be selected (such as Web framework there are more than 100), have a choice where there is an error.
- python interpreter
- The official Python interpreter is written in C language, and it is the most widely used Python interpreter, usually called CPython. In addition, Python interpreter as well as the Java language Jython, IronPython C # language and PyPy, Brython, Pyston other versions
Day 2: Language Elements
- Computer hardware system consists of five parts:
- Operator
- Control
operator and the controller together what we usually call a central processor, its function is to perform various calculations and control processing commands and data in the computer software. - Memory
- input device
The output device
2. The output format
string print function using the output of the placeholder syntax, where% d is an integer from placeholder,% f is the fractional placeholder %% represents the percent (percent because It represents a number placeholder, the placeholder character string with the percent sign must be written to express %%), with the variable rear% after the string value will replace the placeholder and then output to the terminal.Day 3: branch structure
Calculating the area of a triangle (Heron's formula)
P = (A + B + C) / 2
Area = (P * (P - A) * (P - B) * (P - C)) 0.5 **Day 4: cyclic structure
- for-in loop
If you know exactly the number of cycles performed on a container or to iterate (will be mentioned later), then use the for-in loop - while loop
if you do not know the structure loop structure specific number of cycles, then use a while loop. capable of generating a while loop or by conversion to an expression control loop bool value, the expression is True cycle continues, the expression evaluates to False cycle ends.
- Greatest common divisor and least common multiple
x = int(input('x = '))
y = int(input('y = '))
if x > y:
x, y = y, x
for factor in range(x, 0, -1):
if x % factor == 0 and y % factor == 0:
print('%d和%d的最大公约数是%d' % (x, y, factor))
print('%d和%d的最小公倍数是%d' % (x, y, x * y // factor)) #最小公倍数与最大公约数的关系
break- Simple graphic print
row = 6
for i in range(row):
for j in range(i+1):
print("*",end="")
#这个print()起的仅仅起换行的作用
print()
for i in range(row):
for j in range(row-i-1):
print(" ",end="")
for k in range(i+1):
print("*",end="")
print()
for i in range(row):
for j in range(row-i-1):
print(" ",end="")
for k in range(1+2*i):
print("*",end="")
print()
*
**
***
****
*****
******
*
**
***
****
*****
******
*
***
*****
*******
*********
***********
[Finished in 0.5s]Day 5: program logic configured
1. Raymond issue one hundred chicken
"""
公鸡5元一只，母鸡3元一只，小鸡1元三只，
用100块钱买一百只鸡，问公鸡、母鸡、小鸡
各有多少只？
"""
for x in range(1,21):
for y in range(1,33):
z = 100-x-y
if 100 == 5*x+3*y+(1/3)*z:
print("公鸡有%d只；母鸡有%d只；小鸡有%d只"%(x,y,z))#这是暴力法求解，很多时候挺有用，但是有时候不行，这个1/3就是个很大的不定因素
print(1/3)
公鸡有4只；母鸡有18只；小鸡有78只
公鸡有8只；母鸡有11只；小鸡有81只
公鸡有12只；母鸡有4只；小鸡有84只
0.3333333333333333
[Finished in 0.1s]- Fibonacci number
def fib(n):
if n==1:
return 1
if n==2:
return 2
else:
return fib(n-1)+fib(n-2)
for i in range(1,21): #生成前20个数
print(fib(i),end=" ")1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765 10946 [Finished in 0.1s]3. Number of seeking perfection
"""
完美数又称为完全数或完备数，它的所有的真因子
（即除了自身以外的因子）的和（即因子函数）恰
好等于它本身。例如：6（$6=1+2+3$）和28（$28
=1+2+4+7+14$）就是完美数。
"""
for num in range(1,10001):
ls = []
sum = 0
for i in range(1,num):
if num%i==0:
ls.append(i)
if ls!= []:
for i in ls:
sum += i
if sum==num:
print(num)6
28
496
8128
[Finished in 4.2s] #太慢了