python学习笔记

http://www.imooc.com/video/3370

http://www.imooc.com/learn/317

# -*- coding: utf-8 -*-
print 'hello world'
print 45678+0x12fd2

x1 = 1
d = 3
n = 100
x100 = x1+(n-1)*d
s = (x1+x100)*n/2
print s

print u'你好'

print u'''静夜思

床前明月光,
疑是地上霜。
举头望明月，
低头思故乡。'''

print '''静夜思

床前明月光,
疑是地上霜。
举头望明月,
低头思故乡。'''

print 2.5 + 10.0/ 4


sum = 0
x = 1
while x<100:
    sum = (1 + 99)*50/2
    x = x + 1
print sum

sum = 0
x = 1
while x<100:
    sum = sum + x
    x = x + 2
print sum

sum = 0
x = 1
n = 1
while True:
    sum = sum + x
    x = 2 * x
    n = n+1
    if n>20:
        break
print sum

sum = 0
x = 0
while True:
    x = x + 1
    if x > 100:
        break
    if x % 2 == 1:
        sum = sum + x
print sum

for x in [ '1','2','3','4','5','6','7','8' ]:
    for y in [ '2','3','4','5','6','7','8','9' ]:
        if x < y:
            print x + y
            
for x in range(1,9):
    for y in range(x+1,10):
        print str(x) + str(y)
        
d = {
    'Adam': 95,
    'Lisa': 85,
    'Bart': 59
}
for (key, value) in d.items():
    print("%s: %s" % (key, value))
    
    d = {
    'Adam': 95,
    'Lisa': 85,
    'Bart': 59
}
print 'Adam: 95' 
print 'Lisa: 85'
print 'Bart: 59'

d = {
    'Adam': 95,
    'Lisa': 85,
    'Bart': 59
}
for foo in d:
    print foo + ":" + str(d.get(foo))
    
s = set(['Adam', 'Lisa', 'Bart', 'Paul'])
for foo in s:
    if 'adam' == foo.lower() or 'bart' == foo.lower():
        print 'true'
        
s = set([('Adam', 95), ('Lisa', 85), ('Bart', 59)])
for x in s:
    print x[0] + ':' + str(x[1])
    
s = set(['Adam', 'Lisa', 'Paul'])
L = ['Adam', 'Lisa', 'Bart', 'Paul']
for l in L:
    if l in s:
        s.remove(l)
    else:
        s.add(l)
print s

L = [x*x for x in range(1,101)]
print sum(L)

def square_of_sum(L):
    sum = 0
    for l in L:
        sum = sum +l*l
    return sum
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])

import math

def quadratic_equation(a, b, c):
    x = b * b - 4 * a * c
    if x < 0:
        return None
    elif x == 0:
        return -b / (2 *a)
    else:
        return ((math.sqrt(x) - b ) / (2 * a)) , ((-math.sqrt(x) - b ) / (2 * a))

print quadratic_equation(2, 3, 0)
print quadratic_equation(1, -6, 5)

def fact(n):
    if n==1:
        return 1
    return n * fact(n - 1)

fact(5)

# -*- conding=utf-8 -*-

import math

def add(x, y, f):
    return f(x) + f(y)

print add(25, 9, math.sqrt)


#def format_name(s):
#    return s[0].upper()+s[1:].lower()

#print map(format_name, ['adam', 'LISA', 'barT'])


def format_name(s):
    return s.capitalize()

print map(format_name, ['adam', 'LISA', 'barT'])

def prod(x, y):
    return x*y

print reduce(prod, [2, 4, 5, 7, 12])


import math

def is_sqr(x):
    return math.sqrt(x) % 1 == 0

print filter(is_sqr, range(1, 101))


def cmp_ignore_case(s1, s2):
    if s1.lower() > s2.lower():
        return 1
    elif s1.lower() < s2.lower():
        return -1
    else:
        return 0

print sorted(['bob', 'about', 'Zoo', 'Credit'], cmp_ignore_case)


def calc_prod(lst):
    def g(x,y):
        return x*y
    def lazy_prod():
        return reduce(prod,lst)
    return lazy_prod

f = calc_prod([1, 2, 3, 4])
print f()

#用debug调试解析他们的例子
def count():
    fs = []
    for i in range(1, 4):
        def f():
             return i*i
        fs.append(f)
    return fs

f1, f2, f3 = count()    #这一步进入循环 i=1，2，3 分别为f1，f2，f3函数开辟内存空间
print f1()  #而到了这一步，不进入上面的循环了，他直接计算了，用的是最后一个i=3的值计算
print f2()  #同上
print f3()  #同上

#def count():
#    fs = []
#    for i in range(1, 4):
#        def f(m = i):
#            return m*m
#        fs.append(f)
#    return fs

#f1, f2, f3 = count()
#print f1(), f2(), f3()

# -*- coding=utf-8 -*-
'''
Created on 2017年6月19日

@author: ScvQ
'''
def fact(n):
    if n==1:
        return 1
    return n * fact(n - 1)

print fact(5)

def greet(t='world.'):
    if t == 'world.':
        return 'hello,'+t
    else:
        return 'hello,xxx.'
print greet()
print greet('Bart')

def average(*args):
    sum = 0
    return (sum + i for i in args)/args.length    

#print average()
#print average(1, 2)
#print average(1, 2, 2, 3, 4)

L = range(1, 101)

print L[:10]
print L[2:100:3]
print L[4:50:5]

L = ['a','b','c','d']
print L[-2:]
print L[:-2]
print L[-3:-1]

L = range(1, 101)
print L[-10:]
print L[4::5][10:]

def firstCharUpper(s):
    return s[0].upper()+s[1:]

print firstCharUpper('hello')
print firstCharUpper('sunday')
print firstCharUpper('september')

L = ['Adam', 'Lisa', 'Bart', 'Paul']
for index, name in enumerate(L):
    print index+1, '-', name
    
d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59, 'Paul': 74 }

sum = 0.0
for v in d.itervalues():
    sum = sum + v
print sum/len(d)

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59, 'Paul': 74 }

sum = 0.0
for k, v in d.items():
    sum = sum + v
    print k, ':', v
print 'average', ':', sum/len(d)

print [x*(x+1) for x in range(1,101,2)]

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59 }
tds = ['<tr><td>%s</td><td>%s</td></tr>' % (name, score) for name, score in d.iteritems()]
print '<table>'
print '<tr><th>Name</th><th>Score</th><tr>'
print '
'.join(tds)
print '</table>'

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59 }
def generate_tr(name, score):
    if(score<60):
        return '<tr><td>%s</td><td style="color:red">%s</td></tr>' % (name, score)
    else:
        return '<tr><td>%s</td><td>%s</td></tr>' % (name, score)

tds = [generate_tr(name, score) for name, score in d.iteritems()]
print '<table border="1">'
print '<tr><th>Name</th><th>Score</th><tr>'
print '
'.join(tds)
print '</table>'

def toUppers(L):
    return [x.upper() for x in L if isinstance(x,str)]

print toUppers(['Hello', 'world', 101])

print [ m + n + o for m in '123456789' for n in '0123456789' for o in '123456789' if m == o]

print [ 100*m+10*n+o for m in range(1,10) for n in range(10) for o in range(1,10) if m == o]

# -*- coding=utf-8 -*-
'''
Created on 2017年6月19日

@author: ScvQ
'''
def fact(n):
    if n==1:
        return 1
    return n * fact(n - 1)

print fact(5)

def greet(t='world.'):
    if t == 'world.':
        return 'hello,'+t
    else:
        return 'hello,xxx.'
print greet()
print greet('Bart')

def average(*args):
    sum = 0
    return (sum + i for i in args)/args.length    

#print average()
#print average(1, 2)
#print average(1, 2, 2, 3, 4)

L = range(1, 101)

print L[:10]
print L[2:100:3]
print L[4:50:5]

L = ['a','b','c','d']
print L[-2:]
print L[:-2]
print L[-3:-1]

L = range(1, 101)
print L[-10:]
print L[4::5][10:]

def firstCharUpper(s):
    return s[0].upper()+s[1:]

print firstCharUpper('hello')
print firstCharUpper('sunday')
print firstCharUpper('september')

L = ['Adam', 'Lisa', 'Bart', 'Paul']
for index, name in enumerate(L):
    print index+1, '-', name
    
d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59, 'Paul': 74 }

sum = 0.0
for v in d.itervalues():
    sum = sum + v
print sum/len(d)

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59, 'Paul': 74 }

sum = 0.0
for k, v in d.items():
    sum = sum + v
    print k, ':', v
print 'average', ':', sum/len(d)

print [x*(x+1) for x in range(1,101,2)]

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59 }
tds = ['<tr><td>%s</td><td>%s</td></tr>' % (name, score) for name, score in d.iteritems()]
print '<table>'
print '<tr><th>Name</th><th>Score</th><tr>'
print '
'.join(tds)
print '</table>'

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59 }
def generate_tr(name, score):
    if(score<60):
        return '<tr><td>%s</td><td style="color:red">%s</td></tr>' % (name, score)
    else:
        return '<tr><td>%s</td><td>%s</td></tr>' % (name, score)

tds = [generate_tr(name, score) for name, score in d.iteritems()]
print '<table border="1">'
print '<tr><th>Name</th><th>Score</th><tr>'
print '
'.join(tds)
print '</table>'

def toUppers(L):
    return [x.upper() for x in L if isinstance(x,str)]

print toUppers(['Hello', 'world', 101])

print [ m + n + o for m in '123456789' for n in '0123456789' for o in '123456789' if m == o]

print [ 100*m+10*n+o for m in range(1,10) for n in range(10) for o in range(1,10) if m == o