给定一个数字列表, 编写一个Python程序以打印给定列表中的所有正数。
例子:
Input: list1 = [12, -7, 5, 64, -14]
Output: 12, 5, 64
Input: list2 = [12, 14, -95, 3]
Output: [12, 14, 3]
范例1:使用for循环打印给定列表中的所有正数
使用for循环遍历列表中的每个元素, 并检查number是否大于或等于0。如果条件满足, 则仅打印该数字。
# Python program to print positive Numbers in a List
# list of numbers
list1 = [ 11 , - 21 , 0 , 45 , 66 , - 93 ]
# iterating each number in list
for num in list1:
# checking condition
if num > = 0 :
print (num, end = " " )
输出如下:
11 0 45 66
范例2:
使用while循环
# Python program to print positive Numbers in a List
# list of numbers
list1 = [ - 10 , 21 , - 4 , - 45 , - 66 , 93 ]
num = 0
# using while loop
while (num < len (list1)):
# checking condition
if list1[num] > = 0 :
print (list1[num], end = " " )
# increment num
num + = 1
输出如下:
21 93
范例3:
使用
清单理解
# Python program to print Positive Numbers in a List
# list of numbers
list1 = [ - 10 , - 21 , - 4 , 45 , - 66 , 93 ]
# using list comprehension
pos_nos = [num for num in list1 if num > = 0 ]
print ( "Positive numbers in the list: " , * pos_nos)
输出如下:
Positive numbers in the list: 45 93
范例4:
使用
Lambda表达式
# Python program to print positive Numbers in a List
# list of numbers
list1 = [ - 10 , 21 , 4 , - 45 , - 66 , 93 , - 11 ]
# we can also print positive no's using lambda exp.
pos_nos = list ( filter ( lambda x: (x > = 0 ), list1))
print ( "Positive numbers in the list: " , * pos_nos)
输出如下:
Positive numbers in the list: 21, 4, 93
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