条件语句
if condition:
#code list
[
elif condition_1:
#code list
]
...
[
elif condition_n:
#code list
]
[
else:
#code list
]
注1：[]表示optional
注2：elif不能拆分为else if
注3：不支持switch
score = 90
if score >= 90:
print 'excellent'
score = 80
if score >= 60:
print 'pass'
else:
print 'fail'
score = 70
if score >= 90:
print 'A'
elif score >= 80:
print 'B'
elif score >= 70:
print 'C'
elif score >= 60:
print 'D'
else:
print 'E'
循环语句
for...in
sum = 0
for i in range(11):
sum = sum + i
print sum
while
i = 0
sum = 0
while i < 11:
sum = sum + i
i = i + 1
print sum
注：不支持do while
空语句
pass
条件语句
salary = 15000
if salary >= 30000:
print 'very high income'
elif salary >= 20000:
print 'high income'
elif salary >= 10000:
print 'middle income'
else:
print 'low income'
注意：
elif意义是else if，但不能写成else ifelif分支optionalelse分支optional
def judgeCondition(x):
if x:
print True
else:
print False
x = 0
judgeCondition(x)
x = 1
judgeCondition(x)
x = ''
judgeCondition(x)
x = "abc"
judgeCondition(x)
x = ()
judgeCondition(x)
x = (1, 2)
judgeCondition(x)
x = None
judgeCondition(x)
output：
False
True
False
True
False
True
False
单独变量作为判断条件时，有以下情况：
整型&浮点型：0为False，非0为True字符串：空串为False，非空串为Truelist&tuple&dict&set：空为False，非空为True
循环语句
for...in
namelist = ['tom', 'jack', 'martin']
for name in namelist:
print name
while
namelist = ['tom', 'jack', 'martin']
index = 0
while index < len(namelist):
print namelist[index]
index = index + 1
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