python之if语句

#if语句

subjects=['math','English','physical','art','english']

for subject in subjects:

if subject=='English':

print("We must learn well:")

print(subject)

elif subject=='art':

print("I can not learn it well:")

print(subject)

else:

print("our subject")

#确定列表不是空的

subjects= []

if subjects:

for subject in subjects:

print("I get it")

else:

print("Are you sure you want to choose the course?")

#确定列表不是空的

subjects=['math','English','physical','art','english']

if subjects:

for subject in subjects:

print("I get it")

else:

print("Are you sure you want to choose the course?")

#使用多个列表

exist_subjects=['math','English','physical','art','english']

required_subjects=['math','English','chinese','gym',]

for required_subject in required_subjects:

if required_subject in exist_subjects:

print("success")

else:

print("sorry")

#and

age=10

if age<15 and age>5:

print(age)

else:

print(false)

#or

if age>9 or age<5:

print(age)

#检查特定值是否不包含在列表中

subjects=['math','English','physical','art','english']

subject='chinese'

if subject not in subjects:

print("not find here")

else:

print(subject)

#检查特定值是否不包含在列表中

subject='math'

if subject not in subjects:

print("not find here")

else:

print(subject)

#bool语句

subject='chinese'

print(subject=='chinese')

print(subject=='english')