Python实现字符串格式化的五种方法

name = "Forbearing"
age = 18

print("My name is " + name + ", and I am " + str(age) + " years old.")
print("My name is", name, ", and I am", age, "years old.")
print("My name is %s, and I am %d years old." % (name, age))
print(f"My name is {name}, and I am {age} years old.")
print("My name is {}, and I am {} years old.".format(name, age))

print("My name is " + name + ", and I am " + str(age) + " years old.")

print("My name is", name, ", and I am", age, "years old.")

print("A", "B", sep="-")  # A-B
print("X", end="")        # 不换行
print("Y")                # 接着输出

print("My name is %s, and I am %d years old." % (name, age))

print(f"My name is {name}, and I am {age} years old.")

print(f"next year: {age + 1}")
print(f"upper: {name.upper()}")

x = 3.14159
print(f"{x:.2f}")   # 3.14
print(f"{age:05d}") # 00018

print("My name is {}, and I am {} years old.".format(name, age))

print("My name is {n}, and I am {a} years old.".format(n=name, a=age))

x = 3.14159
print("{:.2f}".format(x))  # 3.14