Python|格式化给定列表元素的方法

给定一个浮点值列表，任务是将所有浮点值截断为 2 位十进制数字。让我们看看完成任务的不同方法。
方法#1：使用列表推导

Python3

# Python code to truncate float
# values to 2-decimal digits.
 
# List initialization
Input = [100.7689454, 17.232999, 60.98867, 300.83748789]
 
# Using list comprehension
Output = ["%.2f" % elem for elem in Input]
 
# Printing output
print(Output)

输出：

['100.77', '17.23', '60.99', '300.84']

方法#2：使用地图

Python3

# Python code to truncate float
# values to 2 decimal digits.
 
# List initialization
Input = [100.7689454, 17.232999, 60.98867, 300.83748789]
 
# Using map
Output = map(lambda n: "%.2f" % n, Input)
 
# Converting to list
Output = list(Output)
 
# Print output
print(Output)

输出：

['100.77', '17.23', '60.99', '300.84']

方法#3：使用格式

Python3

# Python code to truncate float
# values to 2 decimal digits.
 
# List initialization
Input = [100.7689454, 17.232999, 60.98867, 300.83748789]
 
# Using format
Output = ['{:.2f}'.format(elem) for elem in Input]
 
# Print output
print(Output)

输出：

['100.77', '17.23', '60.99', '300.84']

方法#4：使用迭代

Python3

# Python code to truncate float
# values to 2 decimal digits.
 
# List initialization
Input = [100.7689454, 17.232999, 60.98867, 300.83748789]
 
# Output list initialization
Output = []
 
# Iterating
for elem in Input:
    Output.append("%.2f" % elem)
 
# Printing output
print(Output)

输出：

['100.77', '17.23', '60.99', '300.84']