python列表生成式
1. 生成列表l = []
for x in range(1, 11):
l.append(x * x)
print l
print ‘\n’
print [x * x for x in range(1, 11)]
print ‘\n’
print [x * (x + 1) for x in range(1, 100, 2)]2. 复杂表达式d = { ‘adam’: 95, ‘lisa’: 85, ‘bart’: 59 }
tds = [‘%s%s’ % (name, score) for name, score in d.iteritems()]
print ”
print ‘namescore’
print ‘\n’.join(tds)
print ”
print ‘\n’
d = { ‘adam’: 95, ‘lisa’: 85, ‘bart’: 59 }
def generate_tr(name, score):
if score < 60:
return '%s%s' % (name, score)
return '%s%s' % (name, score)
tds = [generate_tr(name, score) for name, score in d.iteritems()]
print ''
print 'namescore'
print '\n'.join(tds)
print ''3. 条件过滤print [x * x for x in range(1, 11)]
print '\n'
print [x * x for x in range(1, 11) if x % 2 == 0]
print '\n'
def touppers(l):
return [x.upper() for x in l if isinstance(x, str)]
print touppers(['hello', 'world', 101])4. 多层表达式print [m + n for m in 'abc' for n in '123']
print '\n'
l = []
for m in 'abc':
for n in '123':
l.append(m + n)
print l
print '\n'
print [100 * n1 + 10 * n2 + n3 for n1 in range(1, 10) for n2 in range(10) for n3 in range(10) if n1==n3]
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